Insecticidal composition containing diazinon and buprofezin and application thereof

Abstract

The invention relates to an insecticidal composition containing diazinon and buprofezin, which is characterized in that the insecticidal composition comprises active components, and the active components comprise diazinon and buprofezin; the mass ratio of the diazinon to the buprofezin is (1-10): (10-1); the dosage form of the insecticidal composition is selected from one or more of missible oil, a dispersible oil suspending agent, an emulsion in water, a microemulsion, a suspoemulsion, a microcapsule suspension-suspending agent and water dispersible granules. Each dosage form has the advantages that the storage stability is improved, the lasting period is prolonged (permeability is enhanced by an oil-phase medium), the cost advantage (water replaces a solvent) is realized, and the compatibility is high (the composition can be compounded with other pesticides).

Description

Technical Field

[0001] This invention relates to the field of pesticide formulation technology, and in particular to an insecticidal composition containing diazinon and thiamethoxam and its application. Background Technology

[0002] Scale insects are a global pest that causes serious damage to various agricultural and cash crops. The scale insect's exoskeleton is a waxy layer formed by a mixture of lipids (such as cholesterol) and waxy secretions, possessing high hardness and chemical stability, thus protecting the insect. This waxy layer softens at high temperatures (above 25°C), reducing its physical protective effectiveness; this characteristic is used for targeted control. Scale insect infestations are severe on fruit trees such as citrus, mango, and apple in China. Products on the market for controlling scale insects contain active ingredients such as chlorpyrifos, thiamethoxam, and spirotetramat, with various active ingredients often combined with thiamethoxam. The scale insect market has an annual value of 500-800 million yuan, indicating high market value and significant farmer attention.

[0003] Rice planthoppers are one of the major insect pests of rice, with a global distribution, posing a serious threat to rice production. They reproduce extremely rapidly; under warm (20-30℃) and high humidity (relative humidity above 80%) conditions, their population grows exponentially, multiplying 30-50 times in just 20 days. Their piercing-sucking mouthparts, while feeding on rice sap, can also transmit various viral diseases (such as Southern Black-streaked Dwarf Disease), leading to secondary outbreaks and further exacerbating rice yield losses. As a core pest in major rice-producing countries, the annual market for rice planthopper control reaches billions of yuan, with farmers urgently needing control measures and the public maintaining a high level of concern.

[0004] Although diazinon, as an organophosphate insecticide, is highly effective against piercing-sucking pests, it suffers from drawbacks such as short residual effect and increased pest resistance; while thiamethoxam has a unique mechanism of action that inhibits chitin synthesis in insects, it is weak in killing adults and has poor speed of action.

[0005] The current market urgently needs a compound formulation that can simultaneously achieve rapid and sustained efficacy, broaden the control spectrum, and delay the development of pesticide resistance. This is particularly true for scale insects, which possess significant waxy protective layers. Existing single-agent formulations struggle to penetrate their physical protective barriers, and conventional compound formulations suffer from technical bottlenecks such as poor compatibility of active ingredients and insufficient formulation stability. In emulsifiable concentrates, crystallization is common, and in suspension systems, decomposition of the active ingredient occurs. Furthermore, current technology has not effectively addressed the easily decomposable nature of diazinon, resulting in poor storage stability of the formulation. These technical deficiencies severely restrict the effectiveness of compound formulations in actual agricultural production.

[0006] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides an insecticidal composition containing diazinon and thiamethoxam and its application, which has the advantages of synergistic effect, delaying the development of insecticide resistance in pests, and good storage stability of the formulation product.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an insecticidal composition containing diazinon and thiamethoxam is provided, wherein the insecticidal composition comprises active ingredients, wherein the active ingredients comprise diazinon and thiamethoxam; the mass ratio of diazinon to thiamethoxam is (1-10):(10-1); and the formulation of the insecticidal composition is selected from one or more of emulsifiable concentrates, dispersible oil suspensions, water emulsions, microemulsions, suspensions, microcapsule suspensions-suspensions, and water-dispersible granules.

[0009] Preferably, the mass ratio of the diazinon to the thiamethoxam is (1-5):(5-1), more preferably (1-4):(4-1).

[0010] Preferably, the active ingredient accounts for 5% to 90% of the total mass of the insecticidal composition, more preferably 10% to 80%, and even more preferably 25% to 70%.

[0011] Preferably, the insecticidal composition further includes pesticide-permitted adjuvants selected from one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoamers, solvents, preservatives, stabilizers, synergists, penetrants, structure modifiers, and water.

[0012] Preferably, the formulation of the insecticidal composition is selected from one or more of emulsifiable concentrates, suspension concentrates, and microcapsule suspensions.

[0013] Preferably, the insecticidal composition is in the form of an emulsifiable concentrate, which further includes pesticide-permitted adjuvants.

[0014] Preferably, the auxiliary components in the emulsifiable concentrate are selected from one or more of emulsifiers, stabilizers, and solvents.

[0015] Preferably, the mass percentage of each component in the emulsifiable concentrate is 5%–25% thiamethoxam, 5%–40% diazinon, 10%–20% emulsifier, 1%–5% stabilizer, and the balance being solvent.

[0016] Preferably, the emulsifier is selected from one or more of calcium dodecylbenzenesulfonate, fatty acid polyoxyethylene ether, alkylphenol polyoxyethylene ether, sulfosuccinate, styrene-phenol polyoxyethylene ether, castor oil polyoxyethylene ether, fatty acid polyoxyethylene ester, polyoxyethylene fatty alcohol ether, sorbitan monostearate, dehydrated sorbitan monostearate polyoxyethylene ether, phenethylphenol polyoxyethylene polyoxypropylene ether, or alkylphenol formaldehyde resin polyoxyethylene ether; preferably calcium dodecylbenzenesulfonate and / or castor oil polyoxyethylene ether.

[0017] Preferably, the mass ratio of the calcium dodecylbenzenesulfonate to the castor oil polyoxyethylene ether is (3-8):(7-12), and more preferably (5-6):(9-10).

[0018] Preferably, the stabilizer is selected from one or more of epoxidized soybean oil, epichlorohydrin, BHT, ethyl acetate, and triphenyl phosphate.

[0019] Preferably, the solvent is selected from one or more of N,N-dimethylacetamide, cyclohexanone, 150# solvent oil, 100# solvent oil, 200# solvent oil, dimethylformamide, xylene, N-methylpyrrolidone, methyl oleate, methanol, ethanol, tetrahydrofurfuryl alcohol, toluene, xylene, dimethyl sulfoxide, tetrahydrofuran, n-butanol, isopropanol, turpentine oil, soybean oil, corn oil, rapeseed oil, and castor oil.

[0020] Preferably, the auxiliary ingredients further include synergists.

[0021] Preferably, the emulsifiable concentrate further includes the following components by weight percentage: 1% to 5% synergist.

[0022] Preferably, the synergist is selected from wax solvents.

[0023] Preferably, the insecticidal composition is in the form of a suspension emulsion, which further includes pesticide-permitted auxiliary ingredients.

[0024] Preferably, the auxiliary components in the suspension emulsion include one or more of dispersants, synergists, stabilizers, and water.

[0025] Preferably, the mass percentage of each component in the suspension emulsion is: 10%–30% thiamethoxam, 15%–50% diazinon, 0.1%–5% dispersant, 1%–5% synergist, and the balance being stabilizer.

[0026] Preferably, the mass ratio of the dispersant to the synergist in the suspension emulsion is 1:(1-10), more preferably 1:(1-7).

[0027] Preferably, the dispersant is selected from anionic dispersants.

[0028] Preferably, the synergist is selected from wax solvents.

[0029] Preferably, the stabilizer is selected from phosphate buffer.

[0030] Preferably, the phosphate buffer is selected from one or more of sodium dihydrogen phosphate, disodium hydrogen phosphate, potassium dihydrogen phosphate, and dipotassium hydrogen phosphate.

[0031] Preferably, the pH value of the phosphate buffer is 7.0 to 9.0, more preferably 7.5 to 8.5, and even more preferably 8.0.

[0032] Preferably, the auxiliary components further include an emulsifier.

[0033] Preferably, the suspension emulsion further includes the following components by weight percentage: emulsifier (0-10)%.

[0034] Preferably, the emulsifier is selected from anionic surfactants.

[0035] Preferably, the auxiliary ingredients also include an antifoaming agent.

[0036] Preferably, the suspension emulsion further includes the following components by weight percentage: defoamer (0-3)%.

[0037] Preferably, the defoamer is selected from silicone defoamers, and more preferably one or more of organosiloxanes, organosilicones, defoamer AF1501 and defoamer SAG1572.

[0038] Preferably, the auxiliary ingredients also include a thickener.

[0039] Preferably, the suspension emulsion further includes the following components by weight percentage: 0.1% to 5% thickener.

[0040] Preferably, the thickener is selected from one or more of xanthan gum, hydroxyethyl cellulose, and magnesium aluminum silicate.

[0041] Preferably, the insecticidal composition is in the form of a microcapsule suspension, which further includes pesticide-permitted auxiliary ingredients.

[0042] Preferably, the auxiliary components in the microcapsule suspension are selected from one or more of dispersants, thickeners, and water.

[0043] Preferably, the mass percentage of each component in the microcapsule suspension-suspension agent is: 5%–25% thiamethoxam, 10%–40% diazinon, 0.1%–5% dispersant, 0.1%–5% thickener, and the balance is water.

[0044] Preferably, the dispersant is selected from anionic dispersants.

[0045] Preferably, the thickener is selected from one or more of xanthan gum, hydroxyethyl cellulose, and magnesium aluminum silicate.

[0046] The present invention also provides the application of the insecticidal composition described above in the control of plant pests.

[0047] Preferably, the plant pests include piercing-sucking pests.

[0048] Preferably, the piercing-sucking pests include scale insects and rice planthoppers.

[0049] Preferably, the insecticidal composition is applied in an effective dose to the pest that needs to be controlled or to the medium in which it grows.

[0050] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0051] 1. The present invention provides an insecticidal composition containing diazinon and thiamethoxam and its application. The combination of the two can make up for the disadvantages of poor fast-acting effect of thiamethoxam and poor residual effect of diazinon, and exert both fast-acting and residual effects. It can cover different developmental stages of pests and cover piercing-sucking pests. It has a good control effect on rice planthoppers, fruit tree scale insects and other pests.

[0052] 2. This invention employs a reasonable compound combination, further adding synergistic agents and wax solvents to powerfully dissolve the waxy layer of the insect's epidermis in a short time. It has a strong internal penetration effect, which not only dissolves the insect's epidermal waxy layer, but also stimulates the subcutaneous nerves, affecting the long-term decomposition of enzymes and accelerating the death of the pest.

[0053] 3. The present invention is designed to be suitable pesticide formulations, each of which has the advantages of improved storage stability, enhanced efficacy (oil phase medium enhances permeability), cost advantage (water replaces solvent), and strong compatibility (can be compounded with other pesticides).

[0054] 4. The appropriate pesticide formulation can be selected based on the application scenario. Suitable stabilizers can be chosen to address the problem of easy decomposition of organophosphorus compounds in diazinon, depending on the specific formulation requirements. Detailed Implementation

[0055] To make the technical solution and beneficial effects of the present invention more apparent and understandable, a detailed description is provided below by listing specific embodiments. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0056] This invention provides an insecticidal composition containing diazinon and thiamethoxam, the insecticidal composition comprising active ingredients including diazinon and thiamethoxam; the mass ratio of diazinon to thiamethoxam is (1-10):(10-1); the formulation of the insecticidal composition is selected from one or more of emulsifiable concentrates, dispersible oil suspensions, water emulsions, microemulsions, suspensions, microcapsule suspensions-suspensions, and water-dispersible granules.

[0057] In some embodiments, the mass ratio of the diazinon to the thiamethoxam is (1-5):(5-1).

[0058] In some embodiments, the mass ratio of the diazinon to the thiamethoxam is (1-4):(4-1).

[0059] In some embodiments, the mass ratio of the diazinon to the thiamethoxam is (1-4):1.

[0060] In some embodiments, the mass ratio of the diazinon to the thiamethoxam is (1.6 to 4):1.

[0061] In some embodiments, the formulation of the insecticidal composition is selected from dispersible oil suspensions.

[0062] In some embodiments, the formulation of the insecticidal composition is selected from water-based emulsions.

[0063] In some embodiments, the formulation of the insecticidal composition is selected from microemulsions.

[0064] In some embodiments, the formulation of the insecticidal composition is selected from water-dispersible granules.

[0065] In some embodiments, the active ingredient comprises 5% to 90% of the total mass of the insecticidal composition.

[0066] In some embodiments, the mass of the active ingredient is 10% to 80% of the total mass of the insecticidal composition.

[0067] In some embodiments, the active ingredient comprises 25% to 70% of the total mass of the insecticidal composition.

[0068] In some embodiments, the active ingredient is 26% to 65% of the total mass of the insecticidal composition.

[0069] In some embodiments, the active ingredient is 65% of the total mass of the insecticidal composition.

[0070] In some embodiments, the active ingredient is 52% of the total mass of the insecticidal composition.

[0071] In some embodiments, the active ingredient is 50% of the total mass of the insecticidal composition.

[0072] In some embodiments, the active ingredient comprises 39% of the total mass of the insecticidal composition.

[0073] In some embodiments, the active ingredient is 26% of the total mass of the insecticidal composition.

[0074] In some embodiments, the insecticidal composition further includes pesticide-permitted adjuvants selected from one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoamers, solvents, preservatives, stabilizers, synergists, penetrants, structure modifiers, and water.

[0075] In some embodiments, the formulation of the insecticidal composition is selected from one or more of emulsifiable concentrates, suspension concentrates, and microcapsule suspensions.

[0076] In some embodiments, the formulation of the insecticidal composition is selected from emulsifiable concentrates.

[0077] In some embodiments, the formulation of the insecticidal composition is selected from suspension emulsions.

[0078] In some embodiments, the formulation of the insecticidal composition is selected from microcapsule suspensions.

[0079] In some embodiments, the insecticidal composition is formulated as an emulsifiable concentrate, which further includes pesticide-permitted adjuvants.

[0080] In some embodiments, the auxiliary components in the emulsifiable concentrate are selected from one or more of emulsifiers, stabilizers, and solvents.

[0081] In some embodiments, the mass percentages of each component in the emulsifiable concentrate are 5%–25% thiamethoxam, 5%–40% diazinon, 10%–20% emulsifier, 1%–5% stabilizer, and the balance being solvent.

[0082] In some embodiments, the mass percentages of each component in the emulsifiable concentrate are 10%–20% thiamethoxam, 16%–32% diazinon, 15% emulsifier, 1%–5% stabilizer, and the balance being solvent.

[0083] In some embodiments, the emulsifier in the emulsifiable concentrate is selected from one or more of the following: calcium dodecylbenzenesulfonate, fatty acid polyoxyethylene ether, alkylphenol polyoxyethylene ether, sulfosuccinate, styrene-phenol polyoxyethylene ether, castor oil polyoxyethylene ether, fatty acid polyoxyethylene ester, polyoxyethylene fatty alcohol ether, sorbitan monostearate, dehydrated sorbitan monostearate polyoxyethylene ether, phenethylphenol polyoxyethylene polyoxypropylene ether, or alkylphenol formaldehyde resin polyoxyethylene ether.

[0084] In some embodiments, the emulsifier in the emulsion is selected from calcium dodecylbenzenesulfonate and / or castor oil polyoxyethylene ether.

[0085] In some embodiments, the emulsifier in the emulsion is selected from calcium dodecylbenzenesulfonate and castor oil polyoxyethylene ether.

[0086] In some embodiments, the emulsifier in the emulsion is selected from 505H and / or EL20.

[0087] In some embodiments, the emulsifier in the emulsion is selected from 505H and EL20.

[0088] In some embodiments, the mass ratio of the calcium dodecylbenzenesulfonate to the castor oil polyoxyethylene ether in the emulsion is (3-8):(7-12).

[0089] In some embodiments, the mass ratio of the calcium dodecylbenzenesulfonate to the castor oil polyoxyethylene ether in the emulsion is (5-6):(9-10).

[0090] In some embodiments, the mass ratio of the calcium dodecylbenzenesulfonate to the castor oil polyoxyethylene ether in the emulsion is 5.5:9.5.

[0091] In some embodiments, the stabilizer in the emulsifiable concentrate is selected from one or more of epoxidized soybean oil, epichlorohydrin, BHT, ethyl acetate, and triphenyl phosphate.

[0092] In some embodiments, the solvent in the emulsifiable concentrate is selected from one or more of N,N-dimethylacetamide, cyclohexanone, 150# solvent oil, 100# solvent oil, 200# solvent oil, dimethylformamide, xylene, N-methylpyrrolidone, methyl oleate, methanol, ethanol, tetrahydrofurfuryl alcohol, toluene, xylene, dimethyl sulfoxide, tetrahydrofuran, n-butanol, isopropanol, turpentine oil, soybean oil, corn oil, rapeseed oil, and castor oil.

[0093] In some embodiments, the solvent in the emulsion is selected from one or more of N,N-dimethylacetamide, cyclohexanone, and 150# solvent oil.

[0094] In some embodiments, the solvent in the emulsion is selected from N,N-dimethylacetamide and 150# solvent oil.

[0095] In some embodiments, the solvent in the emulsion is selected from N,N-dimethylacetamide, cyclohexanone, and 150# solvent oil.

[0096] In some embodiments, the auxiliary components in the emulsifiable concentrate further include synergists.

[0097] In some embodiments, the emulsifiable concentrate further includes the following components by weight percentage: 1% to 5% synergist.

[0098] In some embodiments, the emulsifiable concentrate further includes the following components by weight percentage: 2% to 4% synergist.

[0099] In some embodiments, the synergist in the emulsion is selected from wax solvents.

[0100] In some embodiments, the synergist in the emulsion is selected from solvent GL.

[0101] In some embodiments, the mass percentages of each component in the emulsifiable concentrate are: 20% thiamethoxam, 32% diazinon, 15% emulsifier, 3% stabilizer, 3% synergist, and the balance being solvent.

[0102] In some embodiments, the mass percentages of the components in the emulsifiable concentrate are: 15% thiamethoxam, 24% diazinon, 15% emulsifier, 3% stabilizer, 3% synergist, and the balance being solvent.

[0103] In some embodiments, the mass percentages of each component in the emulsifiable concentrate are: 10% thiamethoxam, 16% diazinon, 15% emulsifier, 3% stabilizer, 3% synergist, and the balance being solvent.

[0104] In some embodiments, the insecticidal composition is formulated as a suspension emulsion, which further includes pesticide-permitted auxiliary ingredients.

[0105] In some embodiments, the auxiliary components in the suspension emulsion include one or more of dispersants, synergists, stabilizers, and water.

[0106] In some embodiments, the mass percentages of each component in the suspension emulsion are: 10%–30% thiamethoxam, 15%–50% diazinon, 0.1%–5% dispersant, 1%–5% synergist, and the balance being stabilizer.

[0107] In some embodiments, the mass percentages of each component in the suspension emulsion are: 10%–25% thiamethoxam, 20%–40% diazinon, 0.1%–3% dispersant, 2%–4% synergist, and the balance being stabilizer.

[0108] In some embodiments, the mass ratio of the dispersant to the synergist in the suspension emulsion is 1:(1 to 10).

[0109] In some embodiments, the mass ratio of the dispersant to the synergist in the suspension emulsion is 1:(1-7).

[0110] In some embodiments, the mass ratio of the dispersant to the synergist in the suspension emulsion is 1:(1-5).

[0111] In some embodiments, the dispersant in the suspension emulsion is selected from anionic dispersants.

[0112] In some embodiments, the dispersant in the suspension emulsion is selected from one or more of the following: polymer-modified sulfonates, polycarboxylates, phosphate esters, polyether sulfates, lignin sulfonates, alkylnaphthaleneformaldehyde condensate sulfonates, comb-like polymers, sodium lauryl polyoxyethylene ether sulfate, cresol-formaldehyde sodium salt concentrates, sodium dodecyl sulfate, benzene sulfonates, ethoxyphenol ether sulfonates, modified polyacrylate copolymers, dodecyl polyoxyethylene ether phosphates, and sulfate polyether multi-component complexes.

[0113] In some embodiments, the dispersant in the suspension emulsion is selected from one or more polymer-modified sulfonates and polycarboxylates.

[0114] In some embodiments, the dispersant in the suspension emulsion is selected from polymer-modified sulfonates and polycarboxylates.

[0115] In some embodiments, the synergist in the suspension emulsion is selected from wax solvents.

[0116] In some embodiments, the synergist in the suspension emulsion is selected from high-efficiency wax solvent GL.

[0117] In some embodiments, the stabilizer in the suspension emulsion is selected from phosphate buffer.

[0118] In some embodiments, the phosphate buffer in the suspension emulsion is selected from one or more of sodium dihydrogen phosphate, disodium hydrogen phosphate, potassium dihydrogen phosphate, and dipotassium hydrogen phosphate.

[0119] In some embodiments, the phosphate buffer in the suspension is selected from disodium hydrogen phosphate and potassium dihydrogen phosphate.

[0120] In some embodiments, the pH of the phosphate buffer in the suspension is 7.0 to 9.0.

[0121] In some embodiments, the pH of the phosphate buffer in the suspension is 7.5 to 8.5.

[0122] In some embodiments, the pH of the phosphate buffer in the suspension is 8.0.

[0123] In some embodiments, the auxiliary components in the suspension emulsion also include an emulsifier.

[0124] In some embodiments, the suspension emulsion further includes the following components by weight percentage: emulsifier (0-10)%.

[0125] In some embodiments, the suspension emulsion further includes the following components by weight percentage: emulsifier (0-5%).

[0126] In some embodiments, the suspension emulsion further includes the following components by weight percentage: emulsifier (0-3)%.

[0127] In some embodiments, the emulsifier in the suspension emulsion is selected from anionic surfactants.

[0128] In some embodiments, the emulsifier in the suspension emulsion is selected from one or more of the following: modified phosphate esters, sodium diisooctyl sulfonate, polymer-modified sulfonates, polycarboxylates, phosphate esters, polyether sulfates, lignin sulfonates, alkylnaphthalene formaldehyde condensate sulfonates, high molecular weight comb copolymers, sodium lauryl polyoxyethylene ether sulfate, cresol-formaldehyde sodium salt concentrates, sodium dodecyl sulfate, benzene sulfonates, ethoxyphenol ether sulfonates, modified polyacrylate copolymers, dodecyl polyoxyethylene ether phosphates, and sulfate polyether multi-component complexes.

[0129] In some embodiments, the emulsifier in the suspension emulsion is selected from one or more of modified phosphate esters and sodium diisooctyl sulfonate.

[0130] In some embodiments, the emulsifier in the suspension emulsion is selected from modified phosphate esters and sodium diisooctyl sulfonate.

[0131] In some embodiments, the emulsifier in the suspension emulsion is selected from one or more of TSC-450 and T301A.

[0132] In some embodiments, the emulsifier in the suspension emulsion is selected from TSC-450 and T301A.

[0133] In some embodiments, the auxiliary components in the suspension emulsion further include an antifoaming agent.

[0134] In some embodiments, the suspension emulsion further includes the following component by weight percentage: defoamer (0-3)%.

[0135] In some embodiments, the suspension emulsion further includes the following component by weight percentage: defoamer (0-1.5%).

[0136] In some embodiments, the suspension emulsion further includes the following component by weight percentage: defoamer (0-1)%.

[0137] In some embodiments, the suspension emulsion further includes the following component by weight percentage: defoamer (0-0.5%).

[0138] In some embodiments, the defoamer in the suspension emulsion is selected from silicone defoamers.

[0139] In some embodiments, the defoamer in the suspension emulsion is selected from one or more of organosiloxanes, organosilicones, defoamer AF1501, and defoamer SAG1572.

[0140] In some embodiments, the defoamer in the suspension emulsion is selected from defoamer SAG1572.

[0141] In some embodiments, the defoamer in the suspension emulsion is selected from defoamers.

[0142] In some embodiments, the auxiliary components in the suspension emulsion also include a thickener.

[0143] In some embodiments, the suspension emulsion further includes the following components by weight percentage: 0.1% to 5% thickener.

[0144] In some embodiments, the suspending emulsion further includes the following components by weight percentage: 1% to 4% thickener.

[0145] In some embodiments, the suspending emulsion further includes the following components by weight percentage: 1.5% to 3% thickener.

[0146] In some embodiments, the thickener in the suspending emulsion is selected from one or more of xanthan gum, hydroxyethyl cellulose, and magnesium aluminum silicate.

[0147] In some embodiments, the thickener in the suspending emulsion is selected from xanthan gum.

[0148] In some embodiments, the mass percentages of each component in the suspension emulsion are: 20% thiamethoxam, 32% diazinon, 2.07% dispersant, 2.94% synergist, 1.76% emulsifier, 0.06% defoamer, and the balance being stabilizer.

[0149] In some embodiments, the mass percentages of each component in the suspension emulsion are: 25% thiamethoxam, 42% diazinon, 2.58% dispersant, 3% synergist, and the balance being stabilizer.

[0150] In some embodiments, the mass percentages of each component in the suspension emulsion are: 20% thiamethoxam, 32% diazinon, 1.2% dispersant, 2.90% synergist, 1.75% emulsifier, 0.06% defoamer, 2% thickener, and the balance being stabilizer.

[0151] In some embodiments, the mass percentages of each component in the suspension emulsion are: 10% thiamethoxam, 40% diazinon, 0.6% dispersant, 3.64% synergist, 2.18% emulsifier, 0.07% defoamer, 2% thickener, and the balance being stabilizer.

[0152] In some embodiments, the insecticidal composition is in the form of a microcapsule suspension, which further includes pesticide-permitted auxiliary ingredients.

[0153] In some embodiments, the auxiliary components in the microcapsule suspension are selected from one or more of dispersants, thickeners, and water.

[0154] In some embodiments, the mass percentages of each component in the microcapsule suspension-suspension agent are: 5%–25% thiamethoxam, 10%–40% diazinon, 0.1%–5% dispersant, 0.1%–5% thickener, and the balance being water.

[0155] In some embodiments, the mass percentages of each component in the microcapsule suspension-suspension agent are: 5%–25% thiamethoxam, 10%–40% diazinon, 0.1%–3% dispersant, 0.1%–5% thickener, and the balance being water.

[0156] In some embodiments, the dispersant in the microcapsule suspension is selected from anionic dispersants.

[0157] In some embodiments, the dispersant in the microcapsule suspension is selected from one or more of the following: polymer-modified sulfonates, polycarboxylates, phosphate esters, polyether sulfates, lignin sulfonates, alkylnaphthalene formaldehyde condensate sulfonates, comb-like polymers, sodium lauryl polyoxyethylene ether sulfate, cresol-formaldehyde sodium salt concentrates, sodium dodecyl sulfate, benzene sulfonates, ethoxyphenol ether sulfonates, modified polyacrylate copolymers, dodecyl polyoxyethylene ether phosphates, and sulfate polyether multi-component complexes.

[0158] In some embodiments, the dispersant in the microcapsule suspension is selected from one or more polymer-modified sulfonates and polycarboxylates.

[0159] In some embodiments, the dispersant in the microcapsule suspension is selected from polymer-modified sulfonates and polycarboxylates.

[0160] In some embodiments, the thickener in the microcapsule suspension-suspending agent is selected from one or more of xanthan gum, hydroxyethyl cellulose, and magnesium aluminum silicate.

[0161] In some embodiments, the thickener in the microcapsule suspension is selected from xanthan gum.

[0162] In some embodiments, the mass percentages of the components in the microcapsule suspension are: 15% thiamethoxam, 24% diazinon, 0.9% dispersant, 2% thickener, and the balance being water.

[0163] In some embodiments, the mass percentages of each component in the microcapsule suspension are: 10% thiamethoxam, 16% diazinon, 0.6% dispersant, 2% thickener, and the balance being water.

[0164] The present invention also provides the application of the insecticidal composition described above in the control of plant pests.

[0165] In some embodiments, the plant pests include piercing-sucking pests.

[0166] In some embodiments, the piercing-sucking pests include scale insects and rice planthoppers.

[0167] In some embodiments, the insecticidal composition is applied in an effective dose to the pest that needs to be controlled or to the medium in which it grows.

[0168] In this application, the wax solvent can be selected from commercially available products such as High-Efficiency Wax Solvent GL from Heze Henong Chemical Co., Ltd.

[0169] In this application, the polycarboxylate anionic dispersant can be selected from commercially available products such as Additive B from Tangshan Bangxie Fine Additives Co., Ltd.

[0170] In this application, the polymer-modified sulfonate anionic dispersant can be selected from commercially available product B from Tangshan Bangxie Fine Additives Co., Ltd.

[0171] In this application, the modified phosphate ester anionic surfactant can be selected from commercially available products such as Takemoto Oils & Fats Co., Ltd., including T301A.

[0172] In this application, the sodium diisooctyl sulfonate anionic surfactant can be selected from commercially available products such as TSC-450 from Takemoto Oils & Fats Co., Ltd.

[0173] Where specific experimental steps or conditions are not specified in the embodiments, they can be performed according to the conventional experimental steps or conditions described in the literature in this field. All materials used are commercially available conventional products, including but not limited to the materials used in the embodiments of this invention.

[0174] The method of the present invention will be described below through specific embodiments. It should be understood that these embodiments are used to illustrate the basic principles, main features and advantages of the present invention, and the present invention is not limited to the scope of the following embodiments. The implementation conditions used in the embodiments can be further adjusted according to specific requirements, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0175] Example 1: Screening of Emulsifier Combinations

[0176] Screening of emulsifier combinations in 39% thiamethoxam·diazinon EC (emulsifiable concentrate).

[0177] 39% Thiazide-Diazinon EC (Emulsifiable Concentrate) contains the following ingredients by weight percentage: 15% thiamethoxam (100% basis), 24% diazinon (100% basis), 3% solvent GL (synergist), 15% emulsifier, 3% epoxidized soybean oil (stabilizer), 25% N,N-dimethylacetamide (solvent), and 150# solvent oil (solvent) to make up to 100%.

[0178] Table 1 Screening Table for Emulsifier Combinations

[0179] Serial Number Emulsifier combination Dosage Qualified range Optimal ratio Filtering results 1 505H+1602 15％ none none disuse 2 505H+EL20 15％ 5 / 10-6 / 9 5.5 / 9.5 feasible 3 505H+DP4C 15％ none none disuse

[0180] By combining emulsifier 505H with three nonionic emulsifiers—emulsifier 1602, emulsifier EL20, and emulsifier DP4C—only EL20 met the emulsification stability requirements and can be used as an emulsifier combination for this product.

[0181] After preparing the sample according to the optimal emulsifier ratio, i.e., 505H+EL20 = 5.5%+9.5%, cold and hot storage stability tests were carried out.

[0182] Example 2: 52% Thiazinon·Diazinon emulsifiable concentrate

[0183] It contains the following ingredients by weight percentage: 20% thiamethoxam (100% basis), 32% diazinon (100% basis), 3% solvent GL (synergist), 15% 505H+EL20 (emulsifier), 3% epoxidized soybean oil (stabilizer), 25% N,N-dimethylacetamide (solvent), and 150# solvent oil (solvent), to a total of 100%.

[0184] Preparation method: Mix all active ingredients and auxiliary ingredients thoroughly in proportion to obtain 52% thiamethoxam·diazinon emulsifiable concentrate.

[0185] The above-mentioned 52% thiamethoxam·diazinon emulsifiable concentrate showed a large amount of crystal precipitation during cold storage stability testing.

[0186] After adding 10% cyclohexanone (solvent), no crystals precipitated during cold storage.

[0187] Samples were prepared according to the adjusted formulation and subjected to cold and hot storage stability tests. No crystals precipitated during cold storage, indicating that the emulsifiable concentrate formulation was qualified.

[0188] Example 3: 39% Thiazinon·Diazinon Emulsifiable Concentrate

[0189] It contains the following ingredients by weight percentage: 15% thiamethoxam (100% basis), 24% diazinon (100% basis), 3% solvent GL (synergist), 15% 505H+EL20 (emulsifier), 3% epoxidized soybean oil (stabilizer), 25% N,N-dimethylacetamide (solvent), and 150# solvent oil (solvent) to make up to 100%.

[0190] Preparation method: Mix all active ingredients and auxiliary ingredients thoroughly and evenly in proportion to obtain 39% thiamethoxam·diazinon emulsifiable concentrate.

[0191] The above-mentioned 39% thiamethoxam·diazinon emulsifiable concentrate showed a small amount of crystal precipitation during cold storage stability testing.

[0192] After adding 5% cyclohexanone (solvent), no crystals precipitated during cold storage.

[0193] Samples were prepared according to the adjusted formulation and subjected to cold and hot storage stability tests. No crystals precipitated during cold storage, indicating that the emulsifiable concentrate formulation was qualified.

[0194] Example 4: 26% Thiazinon·Diazinon Emulsifiable Concentrate

[0195] It contains the following ingredients by weight percentage: 10% thiamethoxam (100% basis), 16% diazinon (100% basis), 3% solvent GL (synergist), 15% 505H+EL20 (emulsifier), 3% epoxidized soybean oil (stabilizer), 16% N,N-dimethylacetamide (solvent), and 150# solvent oil (solvent), to make up to 100%.

[0196] Preparation method: Mix all active ingredients and auxiliary ingredients thoroughly in proportion to obtain 26% thiamethoxam·diazinon emulsifiable concentrate.

[0197] The above-mentioned 26% thiamethoxam·diazidin emulsifiable concentrate showed no crystal precipitation during cold storage stability testing, indicating that the emulsifiable concentrate formulation is qualified.

[0198] The cold and hot storage stability test data of the thiamethoxam·diazinon emulsifiable concentrate described in Examples 1 to 4 above are shown in Table 1 below.

[0199] Table 1 Summary of Cold and Hot Storage Stability Test Data for Thiazinon·Diazinon Emulsifiable Oil

[0200]

[0201] Note: Thermal storage stability test conditions: (54±2)℃, 14d.

[0202] Cold storage stability test conditions: (0±2)℃, 7d.

[0203] Example 5: 52% Thiazinon·Diazinon Suspension Emulsion

[0204] Preparation method:

[0205] (1) Preparation of thiamethoxam suspension (SC): Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is as follows: 98% thiamethoxam TC (pesticide technical): 48.45% (100% concentration), adjuvant B: 3%, B material: 2%, phosphate buffer (1 / 12 mmol / L): supplement to 100%, to obtain 48.45% thiamethoxam suspension.

[0206] (2) Preparation of diazinon water-in-oil emulsion (EW): All active ingredients and auxiliary ingredients are thoroughly mixed in proportion. The specific formula is as follows: 96% diazinon TC (pesticide technical): 54.5% 100% phosphate, 5% wax solvent GL, T301A: 2.5%, TSC-450: 0.5%, defoamer SAG1572: 0.1%, phosphate buffer (1 / 12 mmol / L): to be supplemented to 100%, to obtain 54.5% diazinon water-in-oil emulsion.

[0207] (3) Preparation of suspension emulsion: Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is: 50% thiamethoxam suspension: 20% 100% and 54.5% diazinon water emulsion: 32% 100% to obtain 52% thiamethoxam·diazinon suspension emulsion.

[0208] In summary, the 52% thiamethoxam·diazimine suspension emulsion contains the following components by weight percentage: 20% thiamethoxam (100% basis), 32% diazimine (100% basis), 1.24% adjuvant B (dispersant), 0.83% component B (dispersant), 2.94% solvent GL (synergist), 1.47% T301A (emulsifier), 0.29% TSC-450 (emulsifier), 0.06% defoamer SAG1572 (defoamer), and the balance is phosphate buffer (stabilizer).

[0209] The above-mentioned 52% thiamethoxam·diazimine phosphorus suspension emulsion showed that the decomposition rates of thiamethoxam and diazimine phosphorus were both qualified after hot storage; no abnormalities were observed during cold storage.

[0210] Example 6: 65% Thiazinon·Diazinon Suspension Emulsion

[0211] Preparation method:

[0212] (1) Preparation of thiamethoxam suspension (SC): Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is as follows: 98% thiamethoxam TC (pesticide technical): 48.45% (100% concentration), adjuvant B: 3%, B material: 2%, phosphate buffer (1 / 12 mmol / L): supplement to 100%, to obtain 48.45% thiamethoxam suspension.

[0213] (2) Preparation of suspension emulsion: Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is as follows: 48.45% thiamethoxam suspension: 25% 100%; 96% diazinon TC (pesticide technical): 40% 100%; wax solvent GL: 3%; phosphate buffer (1 / 12 mmol / L): supplement to 100% to obtain 65% thiamethoxam·diazinon suspension emulsion.

[0214] In summary, the 65% thiamethoxam·diazimine suspension emulsion contains the following components by weight percentage: 25% thiamethoxam (100% basis), 40% diazimine (100% basis), 1.55% adjuvant B (dispersant), 1.03% B material (dispersant), 3% wax solvent GL (synergist), and the balance is phosphate buffer (stabilizer).

[0215] The above-mentioned 65% thiamethoxam·diazimine phosphorus suspension emulsion showed that the decomposition rates of thiamethoxam and diazimine phosphorus were both qualified after hot storage; no abnormalities were observed during cold storage.

[0216] Example 7: 52% Thiazinon·Diazinon Suspension Emulsion

[0217] Preparation method:

[0218] (1) Preparation of thiamethoxam suspension (SC): Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is: 98% thiamethoxam TC (pesticide technical): 50% (100%), adjuvant B: 1%, B material: 2%, phosphate buffer (1 / 12 mmol / L): supplement to 100%, to obtain 50% thiamethoxam suspension.

[0219] (2) Preparation of diazinon water-in-oil emulsion (EW): All active ingredients and auxiliary ingredients are thoroughly mixed in proportion. The specific formula is as follows: 96% diazinon TC (pesticide technical): 55% (100% soluble), wax solvent GL: 5%, T301A: 2.5%, TSC-450: 0.5%, defoamer SAG1572: 0.1%, phosphate buffer (1 / 12 mmol / L): to be supplemented to 100%, to obtain 55% diazinon water-in-oil emulsion.

[0220] (3) Preparation of suspension emulsion: Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is: 50% thiamethoxam suspension: 20% 100% thiamethoxam, 55% diazinon water emulsion: 32% 100% thiamethoxam, 2% xanthan gum aqueous solution: 2%, to obtain 52% thiamethoxam·diazinon suspension emulsion.

[0221] In summary, the 52% thiamethoxam·diazimine suspension emulsion contains the following components by weight percentage: 20% thiamethoxam (100% basis), 32% diazimine (100% basis), 0.4% adjuvant B (dispersant), 0.8% component B (dispersant), 2.90% wax solvent GL (synergist), 1.45% T301A (emulsifier), 0.30% TSC-450 (emulsifier), 0.06% defoamer SAG1572 (defoamer), 2% 2% xanthan gum aqueous solution (thickener), and the balance is phosphate buffer (stabilizer).

[0222] The above-mentioned 52% thiamethoxam·diazimine phosphorus suspension emulsion showed that the decomposition rates of thiamethoxam and diazimine phosphorus were both qualified after hot storage; no abnormalities were observed during cold storage.

[0223] Example 8: 50% Thiazinon·Diazinon Suspension Emulsion

[0224] Preparation method:

[0225] (1) Preparation of thiamethoxam suspension (SC): Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is: 98% thiamethoxam TC (pesticide technical): 50% (100%), adjuvant B: 1%, B material: 2%, phosphate buffer (1 / 12 mmol / L): supplement to 100%, to obtain 50% thiamethoxam suspension.

[0226] (2) Preparation of diazinon water-in-oil emulsion (EW): All active ingredients and auxiliary ingredients are thoroughly mixed in proportion. The specific formula is as follows: 96% diazinon TC (pesticide technical): 55% (100% soluble), wax solvent GL: 5%, T301A: 2.5%, TSC-450: 0.5%, defoamer SAG1572: 0.1%, phosphate buffer (1 / 12 mmol / L): to be supplemented to 100%, to obtain 55% diazinon water-in-oil emulsion.

[0227] (3) Preparation of suspension emulsion: Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is as follows: 50% thiamethoxam suspension: 10% 100%, 55% diazinon water emulsion: 40% 100%, 2% xanthan gum aqueous solution: 2%, and phosphate buffer (1 / 12 mmol / L) is added to 100% to obtain 50% thiamethoxam·diazinon suspension emulsion.

[0228] In summary, the 50% thiamethoxam·diazimine suspension emulsion contains the following components by weight percentage: 10% thiamethoxam (100% basis), 40% diazimine (100% basis), 0.2% adjuvant B (dispersant), 0.4% component B (dispersant), 3.64% wax solvent GL (synergist), 1.82% T301A (emulsifier), 0.36% TSC-450 (emulsifier), 0.07% defoamer SAG1572 (defoamer), 2% 2% xanthan gum aqueous solution (thickener), and the balance is phosphate buffer (stabilizer).

[0229] The above-mentioned 50% thiamethoxam·diazimine phosphorus suspension emulsion showed that the decomposition rates of thiamethoxam and diazimine phosphorus were both qualified after hot storage; no abnormalities were observed during cold storage.

[0230] Comparative Example 1: 52% Thiazinon·Diazinon Suspension Emulsion

[0231] Preparation method:

[0232] (1) Preparation of thiamethoxam suspension (SC): Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is: 98% thiamethoxam TC (pesticide technical): 48.45% (100%), adjuvant B: 3%, phosphate buffer (1 / 12 mmol / L): to 100%, to obtain 48.45% thiamethoxam suspension.

[0233] (2) Preparation of diazinon water-in-oil emulsion (EW): All active ingredients and auxiliary ingredients are thoroughly mixed in proportion. The specific formula is as follows: 96% diazinon TC (pesticide technical): 54.5% (100% soluble concentrate), T301A: 2.5%, TSC-450: 0.5%, defoamer SAG1572: 0.1%, phosphate buffer (1 / 12 mmol / L): to be supplemented to 100%, to obtain 54.5% diazinon water-in-oil emulsion.

[0234] (3) Preparation of suspension emulsion: Mix all active ingredients and auxiliary ingredients thoroughly and evenly in proportion. 48.45% thiamethoxam suspension: 54.5% diazinon water emulsion = 41.28%: 58.72% (mass ratio) to obtain 52% thiamethoxam·diazinon suspension emulsion.

[0235] In summary, the 52% thiamethoxam·diazimine phosphorus suspension emulsion contains the following components by weight percentage: 20% thiamethoxam, 32% diazimine phosphorus, 1.24% adjuvant B (dispersant), 1.47% T301A (emulsifier), 0.29% TSC-450 (emulsifier), 0.06% defoamer SAG1572 (defoamer), and the balance is phosphate buffer (stabilizer).

[0236] The above-mentioned 52% thiamethoxam·diazimine phosphorus suspension emulsion showed precipitate formation at the bottom after hot storage and water precipitation at the top after cold storage.

[0237] Comparative Example 2: 65% Thiazinon·Diazinon Suspension Emulsion

[0238] Preparation method:

[0239] (1) Preparation of thiamethoxam suspension (SC): Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is: 98% thiamethoxam TC (pesticide technical): 48.45% (100%), adjuvant B: 3%, phosphate buffer (1 / 12 mmol / L): to 100%, to obtain 48.45% thiamethoxam suspension.

[0240] (2) Preparation of suspension emulsion: Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is as follows: 48.45% thiamethoxam suspension: 25% 100% diazinon, 96% diazinon TC (pesticide technical): 40% 100% diazinon, phosphate buffer (1 / 12 mmol / L): supplement to 100%, to obtain 65% thiamethoxam·diazinon suspension emulsion.

[0241] In summary, the 65% thiamethoxam·diazimine suspension emulsion contains the following components by weight percentage: 25% thiamethoxam (100% basis), 40% diazimine (100% basis), 1.55% adjuvant B (dispersant), and the balance is phosphate buffer (stabilizer).

[0242] The above-mentioned 65% thiamethoxam·diazimine phosphorus suspension emulsion showed 40% water superposition after hot storage; no abnormalities were observed during cold storage.

[0243] Comparative Example 3, 52% Thiazinon·Diazinon Suspension Emulsion

[0244] Preparation method:

[0245] (1) Preparation of thiamethoxam suspension (SC): Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is: 98% thiamethoxam TC (pesticide technical): 50% (100% concentration), adjuvant B: 1%, B material: 2%, deionized water: to make up to 100%, to obtain 50% thiamethoxam suspension.

[0246] (2) Preparation of suspension emulsion: Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is as follows: 50% thiamethoxam suspension: 20% 100% diazinon, 96% diazinon TC (pesticide technical): 32% 100% diazinon, 2% xanthan gum aqueous solution: 2%, deionized water: to make up to 100%, to obtain 52% thiamethoxam·diazinon suspension emulsion.

[0247] In summary, the 52% thiamethoxam·diazimine suspension emulsion contains the following components by weight percentage: 20% thiamethoxam (100% basis), 32% diazimine (100% basis), 0.4% adjuvant B (dispersant), 0.8% adjuvant B (dispersant), 2% xanthan gum aqueous solution (thickener), and the balance is water.

[0248] The above-mentioned 52% thiamethoxam·diazimine phosphorus suspension emulsion showed precipitate formation at the bottom after hot storage and water precipitation at the top after cold storage.

[0249] Comparative Example 4: 65% Thiazinon·Diazinon Suspension Emulsion

[0250] Preparation method:

[0251] (1) Preparation of thiamethoxam suspension (SC): Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is as follows: 98% thiamethoxam TC (pesticide technical): 48.45% (100% concentration), adjuvant B: 3%, B material: 2%, phosphate buffer (1 / 12 mmol / L): supplement to 100%, to obtain 48.45% thiamethoxam suspension.

[0252] (2) Preparation of suspension emulsion: Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is as follows: 48.45% thiamethoxam suspension: 25% 100% diazinon, 96% diazinon TC (pesticide technical): 40% 100% diazinon, phosphate buffer (1 / 12 mmol / L): supplement to 100%, to obtain 65% thiamethoxam·diazinon suspension emulsion.

[0253] In summary, the 65% thiamethoxam·diazimine suspension emulsion contains the following components by weight percentage: 25% thiamethoxam (100% basis), 40% diazimine (100% basis), 1.55% adjuvant B (dispersant), 1.03% adjuvant B (dispersant), and the balance is phosphate buffer (stabilizer).

[0254] The above-mentioned 65% thiamethoxam·diazimine phosphorus suspension emulsion showed that the decomposition rates of thiamethoxam and diazimine phosphorus were both qualified after hot storage; no abnormalities were observed during cold storage.

[0255] The cold and hot storage stability test data of the thiamethoxam·diazinon suspension emulsions described in Examples 5-8 and Comparative Examples 1-4 are shown in Table 2 below.

[0256] Table 2 Summary of Cold and Hot Storage Stability Test Data for Thiamethoxam·Diazinon Suspension Emulsion

[0257]

[0258] Note: The liquid should be a free-flowing, easily measurable suspension, and should not have any lumps.

[0259] Thermal storage stability test conditions: (54±2)℃, 14d.

[0260] Cold storage stability test conditions: (0±2)℃, 7d.

[0261] Example 9: 39% Thiazinon·Diazinephos Microcapsule Suspension-Suspension Agent

[0262] Preparation method:

[0263] (1) Preparation of thiamethoxam suspension (SC): Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is: 98% thiamethoxam TC (pesticide technical): 50% (100% concentration), adjuvant B: 1%, B material: 2%, deionized water: to make up to 100%, to obtain 50% thiamethoxam suspension.

[0264] (2) Preparation of microcapsule suspension-suspension: Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is as follows: 50% thiamethoxam suspension: 30%, 40% diazinon CS (commercially available product): 60%, 2% xanthan gum aqueous solution: 2%, deionized water: to make up to 100%, to obtain 39% thiamethoxam·diazinon microcapsule suspension-suspension.

[0265] In summary, the 39% thiamethoxam·diazimine microcapsule suspension contains the following components by mass percentage: 15% thiamethoxam (100% basis), 24% diazimine (100% basis), 0.3% adjuvant B (dispersant), 0.6% component B (dispersant), 2% xanthan gum aqueous solution (thickener), and the balance is water.

[0266] The above-mentioned 39% thiamethoxam·diazimine phosphorus microcapsule suspension-suspension agent showed that after thermal storage, the decomposition rate of thiamethoxam and diazimine phosphorus was qualified, and the appearance showed only slight water separation; after cold storage, the appearance was qualified.

[0267] Example 10: 26% Thiazinon·Diazinephos Microcapsule Suspension - Suspension Agent

[0268] Preparation method:

[0269] (1) Preparation of thiamethoxam suspension (SC): Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is: 98% thiamethoxam TC (pesticide technical): 50% (100% concentration), adjuvant B: 1%, B material: 2%, deionized water: to make up to 100%, to obtain 50% thiamethoxam suspension.

[0270] (2) Preparation of microcapsule suspension-suspension: Mix all active ingredients and auxiliary ingredients thoroughly and evenly according to the proportion. The specific formula is as follows: 50% thiamethoxam suspension: 20%, 40% diazinon CS (commercially available product): 40%, 2% xanthan gum aqueous solution: 2%, deionized water: to make up to 100%, to obtain 26% thiamethoxam·diazinon microcapsule suspension-suspension.

[0271] In summary, the 26% thiamethoxam·diazimine microcapsule suspension contains the following components by mass percentage: 10% thiamethoxam (100% basis), 16% diazimine (100% basis), 0.2% adjuvant B (dispersant), 0.4% component B (dispersant), 2% xanthan gum aqueous solution (thickener), and the balance is water.

[0272] The above-mentioned 26% thiamethoxam·diazimine phosphorus microcapsule suspension-suspension agent exhibits qualified decomposition rates of thiamethoxam and diazimine phosphorus after thermal storage, with only slight water separation in appearance; and qualified appearance after cold storage.

[0273] The cold and hot storage stability test data of the thiamethoxam·diazinephos microcapsule suspension-suspension agent described in Examples 9 and 10 above are shown in Table 3 below.

[0274] Table 3 Summary of Cold and Hot Storage Stability Test Data for Thiazidin·Diazine Phosphate Microcapsule Suspensions

[0275]

[0276] Note: The liquid should be a free-flowing, easily measurable suspension, and should not have any lumps.

[0277] Thermal storage stability test conditions: (54±2)℃, 14d.

[0278] Cold storage stability test conditions: (0±2)℃, 7d.

[0279] Test Example 1

[0280] This experiment used the 65% thiamethoxam·diazinon suspension emulsion (Nantong Jiangshan Pesticide Chemical Co., Ltd., with added synergist-solvent) from Example 6 as the experimental group, and the 65% thiamethoxam·diazinon suspension emulsion (Nantong Jiangshan Pesticide Chemical Co., Ltd., without added synergist-solvent), diazinon single agent (50% diazinon EC, Hasku, Nantong Jiangshan Pesticide Chemical Co., Ltd.), thiamethoxam single agent (25% thiamethoxam WP, Adama Anbang (Jiangsu) Co., Ltd.) and blank group as the control groups to conduct field efficacy trials and verify its effect on controlling the scale insect mulberry scale.

[0281] Test location: Taoyuan, Raoyang, Hengshui;

[0282] Test target: Mulberry scale insect;

[0283] Application time: peak period of newly hatched nymphs;

[0284] Test date: May 2025.

[0285] The first (May 15, 2025) and second (May 28, 2025) pesticides were applied by spraying. The control effect was investigated 7 days after the first application, 13 days after the first application, and 6 days after the second application. The number of residual insects was recorded, and the control effect was calculated. The experimental results are shown in Table 4.

[0286] Table 4. Results of field efficacy trials for controlling mulberry scale insects.

[0287]

[0288] Follow-up during field efficacy trials:

[0289] Seven days after the first application, the following observations were conducted: compared with the blank control, all groups showed dead insects. The control effect of the compound preparations in experimental groups A and B was approximately 70%. No phytotoxicity occurred in the peaches and leaves of any experimental or control group.

[0290] Thirteen days after the first application, the two experimental groups of 65% diazinon·thiamethoxam showed no significant difference, and both were superior to the two control groups of 65% diazinon·thiamethoxam, and both were superior to the control groups of diazinon and thiamethoxam alone; compared with the blank control, the control effect reached more than 80%.

[0291] Six days after the second application, the control effect of the two experimental groups of 65% diazinon·thiamethoxam was about 90% compared with the blank control, and the insects were shriveled. The effect was better than the two control groups of 65% diazinon·thiamethoxam, the diazinon single agent control group, and the thiamethoxam single agent control group.

[0292] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of the present invention that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of the present invention and do not limit the scope of protection of this patent.

Claims

1. An insecticidal composition containing diazinon and thiamethoxam, characterized in that, The insecticidal composition includes an active ingredient, which includes diazinon and thiamethoxam; the mass ratio of diazinon to thiamethoxam is (1-10):(10-1); the formulation of the insecticidal composition is selected from one or more of emulsifiable concentrates, dispersible oil suspensions, water emulsions, microemulsions, suspensions, microcapsule suspensions-suspensions, and water-dispersible granules.

2. The insecticidal composition according to claim 1, characterized in that, The mass ratio of diazinon to thiamethoxam is (1-5):(5-1), preferably (1-4):(4-1). Preferably, the active ingredient accounts for 5% to 90% of the total mass of the insecticidal composition, more preferably 10% to 80%, and even more preferably 25% to 70%.

3. The insecticidal composition according to claim 1, characterized in that, The insecticidal composition further includes pesticide-permitted adjuvants selected from one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoamers, solvents, preservatives, stabilizers, synergists, penetrants, structure modifiers, and water. Preferably, the formulation of the insecticidal composition is selected from one or more of emulsifiable concentrates, suspension concentrates, and microcapsule suspensions.

4. The insecticidal composition according to claim 1, characterized in that, The insecticidal composition is in the form of an emulsifiable concentrate, and the emulsifiable concentrate further includes pesticide-permitted auxiliary ingredients; Preferably, the auxiliary components in the emulsifiable concentrate are selected from one or more of emulsifiers, stabilizers, and solvents.

5. The insecticidal composition according to claim 4, characterized in that, The mass percentages of each component in the emulsifiable concentrate are: 5%–25% thiamethoxam, 5%–40% diazinon, 10%–20% emulsifier, 1%–5% stabilizer, and the remainder is solvent; Preferably, the emulsifier is selected from one or more of the following: calcium dodecylbenzenesulfonate, fatty acid polyoxyethylene ether, alkylphenol polyoxyethylene ether, sulfosuccinate, styrene-phenol polyoxyethylene ether, castor oil polyoxyethylene ether, fatty acid polyoxyethylene ester, polyoxyethylene fatty alcohol ether, sorbitan monostearate, dehydrated sorbitan monostearate polyoxyethylene ether, phenethylphenol polyoxyethylene polyoxypropylene ether, or alkylphenol formaldehyde resin polyoxyethylene ether; preferably calcium dodecylbenzenesulfonate and / or castor oil polyoxyethylene ether. Preferably, the mass ratio of the calcium dodecylbenzenesulfonate to the castor oil polyoxyethylene ether is (3-8):(7-12), more preferably (5-6):(9-10); Preferably, the stabilizer is selected from one or more of epoxidized soybean oil, epichlorohydrin, BHT, ethyl acetate, and triphenyl phosphate; Preferably, the solvent is selected from one or more of N,N-dimethylacetamide, cyclohexanone, 150# solvent oil, 100# solvent oil, 200# solvent oil, dimethylformamide, xylene, N-methylpyrrolidone, methyl oleate, methanol, ethanol, tetrahydrofurfuryl alcohol, toluene, xylene, dimethyl sulfoxide, tetrahydrofuran, n-butanol, isopropanol, turpentine oil, soybean oil, corn oil, rapeseed oil, and castor oil; Preferably, the auxiliary ingredients further include synergists; Preferably, the emulsifiable concentrate further includes the following components by weight percentage: 1% to 5% synergist; Preferably, the synergist is selected from wax solvents.

6. The insecticidal composition according to claim 1, characterized in that, The insecticidal composition is in the form of a suspension emulsion, and the suspension emulsion further includes pesticide-permitted auxiliary ingredients; Preferably, the auxiliary components in the suspension emulsion include one or more of dispersants, synergists, and stabilizers.

7. The suspending emulsion according to claim 6, characterized in that, The mass percentages of each component in the suspension emulsion are as follows: 10%–30% thiamethoxam, 15%–50% diazinon, 0.1%–5% dispersant, 1%–5% synergist, and the balance being stabilizer; Preferably, the mass ratio of the dispersant to the synergist in the suspension emulsion is 1:(1-10), more preferably 1:(1-7); Preferably, the dispersant is selected from anionic dispersants; Preferably, the synergist is selected from wax solvents; Preferably, the stabilizer is selected from phosphate buffer; Preferably, the phosphate buffer is selected from one or more of sodium dihydrogen phosphate, disodium hydrogen phosphate, potassium dihydrogen phosphate, and dipotassium hydrogen phosphate; Preferably, the pH value of the phosphate buffer is 7.0 to 9.0, more preferably 7.5 to 8.5, and even more preferably 8.0; Preferably, the auxiliary components further include an emulsifier; Preferably, the suspension emulsion further includes the following components by weight percentage: emulsifier (0-10)%; Preferably, the emulsifier is selected from anionic surfactants; Preferably, the auxiliary ingredients further include an antifoaming agent; Preferably, the suspension emulsion further includes the following components by weight percentage: defoamer (0-3)%; Preferably, the defoamer is selected from silicone defoamers, and more preferably one or more of organosiloxanes, organosilicones, defoamer AF1501 and defoamer SAG1572; Preferably, the auxiliary ingredients further include a thickener; Preferably, the suspension emulsion further includes the following components by weight percentage: 0.1% to 5% thickener; Preferably, the thickener is selected from one or more of xanthan gum, hydroxyethyl cellulose, and magnesium aluminum silicate.

8. The insecticidal composition according to claim 1, characterized in that, The insecticidal composition is in the form of a microcapsule suspension, and the microcapsule suspension further includes pesticide-permitted auxiliary ingredients. Preferably, the auxiliary components in the microcapsule suspension are selected from one or more of dispersants, thickeners, and water.

9. The insecticidal composition according to claim 8, characterized in that, The mass percentages of each component in the microcapsule suspension-suspension agent are as follows: thiamethoxam 5%–25%, diazinon 10%–40%, dispersant 0.1%–5%, thickener 0.1%–5%, and the remainder is water; Preferably, the dispersant is selected from anionic dispersants; Preferably, the thickener is selected from one or more of xanthan gum, hydroxyethyl cellulose, and magnesium aluminum silicate.

10. The use of the insecticidal composition according to any one of claims 1-9 in the control of plant pests; Preferably, the plant pests include piercing-sucking pests; Preferably, the piercing-sucking pests include scale insects and rice planthoppers; Preferably, the insecticidal composition is applied in an effective dose to the pest that needs to be controlled or to the medium in which it grows.

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