Insecticidal composition, insecticidal preparation and application thereof

Abstract

The invention relates to the technical field of agricultural pest control, in particular to an insecticidal composition, an insecticidal preparation and application of the insecticidal composition and the insecticidal preparation. The insecticidal composition comprises fenoxycarb and cyromazine in a mass ratio of (1-80): (1-80). By selecting fenoxycarb and cyromazine for compounding, the pest control effect can be remarkably improved, the lasting period is remarkably prolonged compared with that of a single agent, the generation of resistance is delayed, and the pesticide cost, residues on agricultural products and the influence degree on the environment can be further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural pest control, and particularly relates to an insecticidal composition, an insecticidal preparation and their applications. Background Art

[0002] Bradysia odoriphaga Yang et Zhang, also known as Chinese chive gnat, belongs to the Diptera, Sciaridae, Bradysia, and is an important underground pest mainly harming Chinese chives, garlic, onions and welsh onions. It is a major enemy in the production of Chinese chives in open fields and protected areas. Its insect states include adults, eggs, larvae and pupae. The larvae gather and damage the bulbs and tender stems at the underground part of Chinese chives. Newly hatched larvae first damage the base of the leaf sheath and the upper end of the bulb of Chinese chives. In spring and autumn, they mainly damage the young stems of Chinese chives, causing rot and withering of the Chinese chive leaves. In summer, the larvae move downward and bore into the bulbs. In severe cases, the bulbs rot and the whole clump of Chinese chives dies. In open-field Chinese chives, the Chinese chive gnats generally cause serious damage in March - April and September - October. In protected-area Chinese chives, the Chinese chive gnats reproduce and cause damage throughout the year. The generation alternation of Chinese chive gnats is serious, and the control is becoming more and more difficult. In order to pursue the control effect, some farmers even use highly toxic pesticides, which not only enhance the drug resistance of Chinese chive gnats and reduce the drug efficacy, but also easily lead to problems such as excessive pesticide residues, ecological environment damage, and food safety.

[0003] At present, the chemical pesticides for controlling Chinese chive gnats mainly include neonicotinoid pesticides, insect growth regulators and pyrethroids. Neonicotinoid pesticides have the problem of having a serious negative impact on pollinating insects. Currently, imidacloprid, thiamethoxam and clothianidin are completely prohibited from outdoor use in the European Union. Currently, the registered mixtures in China are all mixtures of neonicotinoid pesticides and other pesticides. In current actual production, during the peak period of Chinese chive gnat damage, after each cutting of Chinese chives, irrigation of the roots is basically carried out once, which is extremely likely to cause the problem of excessive residues in Chinese chives. Insect growth regulators are compounds that control pests by disrupting the physiological functions of insects. Their insecticidal effect is relatively slow, but they can inhibit the pest population for a long time. These compounds have high biological activity, are pollution-free, have strong specificity, and are relatively safe for humans, livestock and target organisms; they are easily degraded in the environment and have low residual toxicity; they can not only control pests with resistant strains, but also have an inhibitory effect on pests with resistance to the nervous system and electron conduction system. However, in the current prior art, there is still room for further improvement in terms of safety, toxicity and long-lasting effect when applying insect growth regulators.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the present invention provides an insecticidal composition, an insecticidal preparation and their applications, and the insecticidal composition.

[0006] The specific technical solution of the present invention is as follows:

[0007] In a first aspect, the present invention first provides an insecticidal composition comprising fenoxycarb and cyromazine in a mass ratio of 1 to 80:1 to 80.

[0008] Fenoxycarb is a non-terpenoid insect growth regulator insecticide with juvenile hormone activity, which interferes with insect development and growth by mimicking the action of insect juvenile hormone; cyromazine is a triazine insect growth regulator insecticide with ecdysone activity, having strong systemic conduction, and having special activity against dipteran larvae, which can induce morphological aberrations in dipteran larvae and pupae, and incomplete or inhibited adult emergence; the action mechanisms of the two are completely different, but the present invention unexpectedly finds that the compounding of fenoxycarb and cyromazine has an obvious synergistic effect, can significantly improve the control effect of pests, and the effective period is significantly extended compared with the single agent, delaying the generation of resistance, and thus can reduce the drug cost, the residue on agricultural products and the impact on the environment.

[0009] Preferably, the insecticidal composition comprises fenoxycarb and cyromazine in a mass ratio of 1 to 40:1 to 40.

[0010] Preferably, the insecticidal composition comprises fenoxycarb and cyromazine in a mass ratio of 1 to 20:1 to 20.

[0011] Preferably, the insecticidal composition comprises fenoxycarb and cyromazine in a mass ratio of 1 to 5:1 to 5.

[0012] Preferably, the insecticidal composition consists of fenoxycarb and cyromazine in a mass ratio of 1 to 40:1 to 40.

[0013] Preferably, the insecticidal composition consists of fenoxycarb and cyromazine in a mass ratio of 1 to 20:1 to 20.

[0014] Preferably, the insecticidal composition consists of fenoxycarb and cyromazine in a mass ratio of 1 to 5:1 to 5.

[0015] In a second aspect, the present invention provides the application of the insecticidal composition in the preparation of insecticidal preparations.

[0016] In a third aspect, the present invention provides an insecticidal preparation containing the insecticidal composition.

[0017] Preferably, the insecticidal preparation comprises the insecticidal composition and excipients; in the insecticidal preparation, the dosage of the insecticidal composition is 5 to 80 wt%, preferably 5 to 60 wt%, more preferably 5 to 40 wt%.

[0018] Preferably, the excipients include agriculturally acceptable surfactants and carriers.

[0019] In specific embodiments, the surfactant can be selected from various surfactants well-known in the field of pesticide formulations; preferably, it is one or more of emulsifiers, dispersants, and wetting agents.

[0020] In the present invention, the emulsifier can be various emulsifiers well-known in the field of pesticide formulations. Specifically, the emulsifier can be one or more of calcium dodecylbenzenesulfonate, triphenylethylphenol polyoxyethylene ether phosphate, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, alkylphenol polyoxyethylene polyoxypropylene ether, fatty amine, ethylene oxide adduct of fatty amide, fatty acid polyoxyethylene ester, ethylene oxide adduct of rosin acid, polyol fatty acid ester and its ethylene oxide adduct, styrylphenyl polyoxyethylene ether, alkylphenol formaldehyde resin polyoxyethylene ether, terminal hydroxyl polyoxyethylene polyoxypropylene ether, styrylphenol formaldehyde resin, polyoxyethylene polyoxypropylene ether, and castor oil polyoxyethylene ether.

[0021] In the present invention, the dispersant can be various dispersants well-known in the field of pesticide formulations. Specifically, the dispersant can be one or more of sodium acrylate homopolymer, disodium maleate, sodium salt of naphthalene sulfonic acid formaldehyde condensate, sulfonate of rosin block polyoxyethylene ether polyoxypropylene ether, block copolymer of terminal hydroxyl polyoxyethylene polyoxypropylene ether, triphenylethylphenol polyoxyethylene ether phosphate, fatty alcohol polyoxyethylene ether phosphate, sodium salt of p-hydroxyphenyl lignin sulfonate, and calcium lignosulfonate.

[0022] In the present invention, the wetting agent can be various wetting agents well-known in the field of pesticide formulations. Specifically, the wetting agent can be one or more of sodium dodecyl sulfate, secondary alkyl sodium sulfate, sodium dodecylbenzenesulfonate, fatty alcohol polyoxyethylene ether, alkylnaphthalenesulfonate, and sulfate of alkylphenol resin polyoxyethylene ether.

[0023] In specific embodiments, the carrier can be various carriers well-known in the field of pesticide formulations, including various silicate-based, carbonate-based, sulfate-based, oxide-based, phosphate-based, plant carrier-based, or synthetic carrier-based materials, etc. Specifically, for example: the carrier can be one or more of silica, kaolin, diatomaceous earth, clay, talc, organic bentonite, pumice, titanium dioxide, dextrin, cellulose powder, light calcium carbonate, soluble starch, corn starch, sawdust powder, urea, amine fertilizer, a mixture of urea and amine fertilizer, glucose, maltose, sucrose, anhydrous potassium carbonate, anhydrous sodium carbonate, anhydrous potassium bicarbonate, anhydrous sodium bicarbonate, attapulgite, a mixture of anhydrous potassium carbonate and anhydrous potassium bicarbonate, and a mixture of anhydrous sodium carbonate and anhydrous sodium bicarbonate.

[0024] In addition, the pesticidal preparation of the present invention may further contain various preparation auxiliaries commonly used in the field of pesticide formulations; specifically, the auxiliaries used in this preparation may be one or more of solvents, cosolvents, thickeners, antifreezing agents, protectants, defoamers, disintegrants, stabilizers, preservatives, and binders.

[0025] In the present invention, the solvent may be various solvents well-known in the field of pesticide formulations, and it can also be used as a cosolvent. Specifically, the solvent may be one or more of organic solvents, vegetable oils, mineral oils, solvent oils, and water.

[0026] In the present invention, the organic solvents include one or more of N-methylpyrrolidone, tetrahydrofuran, dimethyl sulfoxide, N,N-dimethyldecanamide, N,N-dimethylformamide, mesitylene, pseudocumene, xylene, toluene, octane, heptane, methanol, isopropanol, n-butanol, tetrahydrofurfuryl alcohol, tributyl phosphate, 1,4-dioxane, and cyclohexanone.

[0027] In the present invention, the vegetable oils include one or more of methylated vegetable oils, rosin-based vegetable oils, turpentine, epoxidized soybean oil, soybean oil, peanut oil, rapeseed oil, castor oil, corn oil, and pine seed oil.

[0028] In the present invention, the mineral oils include one or more of liquid paraffin, machine oil, kerosene, and lubricating oil.

[0029] In the present invention, the antifreezing agent may be various antifreezing agents well-known in the field of pesticide formulations, preferably one or more of ethylene glycol, propylene glycol, glycerol, and urea.

[0030] In the present invention, the thickener may be various thickeners well-known in the field of pesticide formulations. Specifically, the thickener may be one or more of xanthan gum, polyvinyl alcohol, polypropylene alcohol, polyethylene glycol, silica white, diatomaceous earth, kaolin, clay, sodium alginate, magnesium aluminum silicate, sodium aluminum silicate, carboxymethyl cellulose, sodium hydroxypropyl cellulose, and organic bentonite.

[0031] In the present invention, the defoamer may be various defoamers well-known in the field of pesticide formulations. Preferably, the defoamer of the present invention is one or more of organosiloxanes, tributyl phosphate, and silicone.

[0032] In the present invention, the stabilizer is selected from one or more of triphenyl phosphite, epichlorohydrin, and acetic anhydride.

[0033] In the present invention, the preservative is selected from one or more of benzoic acid, sodium benzoate, 1,2-benzisothiazolin-3-one (abbreviation: BIT), Kathon, and potassium sorbate.

[0034] In the present invention, the dosage form of the insecticidal preparation can be various dosage forms commonly used in the art, for example, it can be an emulsifiable concentrate, a water emulsion, a water suspension concentrate, a suspo-emulsion, a dispersible oil suspension, a wettable powder or a water-dispersible granule.

[0035] The present invention further provides a method for preparing the insecticidal preparation, including mixing the insecticidal composition and auxiliary materials; specifically, those skilled in the art can select conventional mixing equipment and techniques according to the actual situation to mix the insecticidal composition and auxiliary materials, which are not limited herein.

[0036] In the present invention, the emulsifiable concentrate preparation includes: the insecticidal composition, a cosolvent, an emulsifier and a solvent.

[0037] Preferably, the composition of the water emulsion or microemulsion by weight is 1-95 parts of the insecticidal composition, 1-30 parts of the emulsifier, 0-30 parts of the cosolvent, 1-30 parts of the solvent, 0-10 parts of the antifreeze agent, 0-10 parts of the thickener, and 3-97 parts of water.

[0038] The preparation method of the above emulsifiable concentrate can include, for example: mixing and stirring the insecticidal composition, the solvent, the cosolvent and the emulsifier to form a uniform and transparent oil phase, and then the emulsifiable concentrate can be obtained. The preparation method of the above water emulsion can include, for example, mixing the insecticidal composition, the emulsifier, the cosolvent and the solvent to form a uniform oil phase; mixing water, the thickener, the antifreeze agent, etc. to form a uniform water phase. Under high-speed shearing, the water phase is added to the oil phase or the oil phase is added to the water phase to form a water emulsion with good dispersibility.

[0039] In the present invention, the composition of the suspo-emulsion by weight is 1-95 parts of the insecticidal composition, 1-30 parts of the solvent, 1-30 parts of the emulsifier, 1-30 parts of the surfactant, 1-10 parts of the antifreeze agent, 0.1-5 parts of the thickener and 0.9-94.9 parts of water.

[0040] Preferably, the composition of the water suspension concentrate by weight is 1-95 parts of the insecticidal composition, 1-30 parts of the surfactant, 1-10 parts of the antifreeze agent, 0.1-5 parts of the thickener and 2.9-96.9 parts of water.

[0041] The preparation method of the above suspo-emulsion includes: using water as a medium, adding the insecticidal composition, the surfactant and auxiliary agents, etc. into a sand mill kettle, grinding to a certain particle size, filtering, and completing the preparation of the suspension component for standby; the other component is prepared according to the above preparation method of the water emulsion; the two components are mixed evenly according to the ratio to obtain a suspo-emulsion. Then, the measured thickener is added to the ground mother liquor and dispersed evenly to make a suspo-emulsion.

[0042] Preparation method of aqueous suspension concentrate: Using water as the medium, add the insecticidal composition, surfactant, auxiliary agent, etc. into a sand mill kettle, grind until a certain particle size, and then filter. Then add the measured thickener into the ground mother liquor, shear and disperse evenly to prepare the aqueous suspension concentrate.

[0043] Preferably, the composition of the dispersible oil suspension concentrate by weight is: 1-95 parts of insecticidal composition, 1-30 parts of surfactant, 1-10 parts of antifreeze, 0.1-5 parts of thickener, and 2.9-96.9 parts of oil.

[0044] Preparation method of dispersible oil suspension concentrate: Using oil as the medium, add the insecticidal composition, surfactant, auxiliary agent, etc. into a sand mill kettle, grind until a certain particle size, and then filter. Then add the measured thickener into the ground mother liquor, shear and disperse evenly to prepare the dispersible oil suspension concentrate.

[0045] Preferably, the composition of the water dispersible granule or wettable powder by weight is: 1-95 parts of insecticidal composition, 1-30 parts of surfactant, and 4-98 parts of other carriers.

[0046] Among them, the preparation method of water dispersible granule is: Mix the insecticidal composition, dispersant, wetting agent, carrier, etc. evenly, then pulverize to a certain particle size by air flow, add water for kneading, and finally add it into a granulator for granulation. After drying, the water dispersible granule or soluble granule can be obtained.

[0047] The preparation method of wettable powder is: Fully mix the insecticidal composition, various auxiliary agents and other carriers, fillers, and pulverize with an ultra-fine pulverizer.

[0048] Fourthly, the present invention provides the application of the described insecticidal composition or the described insecticidal preparation in controlling crop pests.

[0049] Preferably, the crops include Chinese chives, garlic or scallions.

[0050] Preferably, the pests are Diptera pests; more preferably, the Diptera pests include Bradysia odoriphaga.

[0051] The present invention finds that using the described insecticidal composition and insecticidal preparation to control pests in Chinese chive, garlic, and scallion fields, especially the control effect on Bradysia odoriphaga is extremely significant, and the safety for crops is relatively high.

[0052] Preferably, the usage method of the insecticidal composition includes: At the initial stage of pest occurrence, according to the application rate of 60-120 g of insecticidal composition per mu of crops, dilute with water and then irrigate the roots.

[0053] In specific implementation, the insecticidal composition can be applied at a dosage of 60g, 70g, 80g, 90g, 100g, 110g, or 120g per mu of crops, and water is added and then the roots are irrigated.

[0054] More preferably, at a dosage of 90g of the insecticidal composition per mu, 250 liters of water is added and evenly poured on the rhizomes of Chinese chives, and then sufficient water is poured.

[0055] Based on the above technical solutions, the beneficial effects of the present invention are as follows:

[0056] By selecting fenoxycarb and cyromazine for compounding, the present invention can significantly improve the control effect on pests, and the effective period is significantly extended compared with single agents, delaying the generation of resistance, and thus can reduce the application cost, the residue on agricultural products and the impact on the environment. Specific Embodiments

[0057] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0058] Unless otherwise specified, those without specific conditions in the embodiments are carried out according to conventional conditions or conditions recommended by the manufacturer. Those reagents or instruments without indicating the manufacturer can be obtained as conventional products through commercial purchase.

[0059] In the following examples and comparative examples, the purity of the fenoxycarb technical material is 96%, and the manufacturer is Jiangsu Changlong Agrochemical Co., Ltd.; the purity of the cyromazine technical material is 98%, and the manufacturer is Jiangxi Heyi Chemical Industry Co., Ltd.

[0060] In the following examples, the dosages of the insecticidal composition are all actual dosages, that is, calculated based on the dosages after subtracting impurities.

[0061] Example 1

[0062] This example first provides an insecticide composition, which is composed of 5g of fenoxycarb and 200g of cyromazine.

[0063] This example further provides an insecticidal preparation (dispersion oil suspension), and its formula is as follows:

[0064] 5g of fenoxycarb, 200g of cyromazine, 50g of castor oil polyoxyethylene ether (40), 50g of alkylphenol polyoxyethylene ether phosphate, 40g of organic bentonite, and methyl oleate are added to make 1000g.

[0065] The preparation method of the insecticidal preparation comprises the following steps:

[0066] Using methyl oleate as the medium, add the above-mentioned fenoxycarb, cyromazine, castor oil polyoxyethylene ether (40), alkylphenol polyoxyethylene ether phosphate, and organobentonite into a sand mill kettle and grind them finely to obtain a dispersible oil suspension containing 20.5% by weight of the insecticidal composition.

[0067] Example 2

[0068] This example provides an insecticide composition and an insecticidal preparation, the difference from Example 1 being only that: the mass ratio of fenoxycarb to cyromazine in the insecticide composition is 1:30.

[0069] Example 3

[0070] This example first provides an insecticide composition composed of 10 g of fenoxycarb and 200 g of cyromazine.

[0071] This example further provides an insecticidal preparation (wettable powder), and its formula is as follows:

[0072] 10 g of fenoxycarb, 200 g of cyromazine, 80 g of naphthalene sulfonate, 60 g of dodecyl sulfate, and diatomaceous earth are added up to 1000 g.

[0073] The preparation method of the insecticidal preparation comprises the following steps:

[0074] Mix and pulverize the above-mentioned fenoxycarb, cyromazine, naphthalene sulfonate, dodecyl sulfate, and diatomaceous earth to make a wettable powder containing 21% by weight of the insecticidal composition.

[0075] Example 4

[0076] This example provides an insecticide composition and an insecticidal preparation, the difference from Example 1 being only that: the mass ratio of fenoxycarb to cyromazine in the insecticide composition is 1:10.

[0077] Example 5

[0078] This example first provides an insecticide composition composed of 50 g of fenoxycarb and 250 g of cyromazine.

[0079] This example further provides an insecticidal preparation (emulsion in water), and its formula is as follows:

[0080] 50 g of fenoxycarb, 250 g of cyromazine, 40 g of triphenylvinylphenol polyoxyethylene ether (emulsifier), 30 g of calcium dodecylbenzenesulfonate, 50 g of solvent oil, and water are added up to 1 kg;

[0081] The preparation method of the insecticidal preparation comprises the following steps:

[0082] Mix the above-mentioned weights of fenoxycarb, cyromazine, castor oil polyoxyethylene ether, calcium dodecylbenzenesulfonate, and solvent oil to form a homogeneous oil phase; add the oil phase to water and shear-emulsify to obtain an emulsion in water containing 30% by weight of the insecticidal composition.

[0083] Example 6

[0084] This example first provides an insecticide composition which consists of 100 g of fenoxycarb and 200 g of cyromazine.

[0085] This example further provides an insecticidal preparation (emulsion in water), and its formula is as follows:

[0086] 100 g of fenoxycarb, 200 g of cyromazine, 50 g of castor oil polyoxyethylene ether (40) (emulsifier), 20 g of calcium dodecylbenzenesulfonate, 100 g of solvent oil, and water is made up to 1 kg;

[0087] The preparation method of the said insecticidal preparation includes the following steps:

[0088] Mix the above-mentioned weights of fenoxycarb, cyromazine, castor oil polyoxyethylene ether (40), calcium dodecylbenzenesulfonate, and solvent oil to form a homogeneous oil phase; add the oil phase to water and shear-emulsify to obtain an emulsion in water containing 30% by weight of the insecticidal composition.

[0089] Example 7

[0090] This example first provides an insecticide composition which consists of 100 g of fenoxycarb and 100 g of cyromazine.

[0091] This example further provides an insecticidal preparation (water dispersible granule), and its formula is as follows:

[0092] 100 g of fenoxycarb, 100 g of cyromazine, 60 g of naphthalene sulfonate, 60 g of polycarboxylate, 60 g of starch, and diatomaceous earth is made up to 1000 g.

[0093] The preparation method of the said insecticidal preparation includes the following steps:

[0094] Mix and crush the above-mentioned fenoxycarb, cyromazine, naphthalene sulfonate, polycarboxylate, starch, and diatomaceous earth, and extrude and granulate to make a water dispersible granule containing 20% by weight of the insecticidal composition.

[0095] Example 8

[0096] This example first provides an insecticide composition which consists of 200 g of fenoxycarb and 100 g of cyromazine.

[0097] This example further provides an insecticidal preparation (water dispersible granule), and its formula is as follows:

[0098] 200 g of fenoxycarb, 100 g of cyromazine, 70 g of naphthalene sulfonate, 70 g of alkylphenol resin polyoxyethylene ether sulfate, 50 g of polycarboxylate, 90 g of starch, and diatomaceous earth to make up 1000 g.

[0099] The preparation method of the insecticidal preparation comprises the following steps:

[0100] Mix and pulverize the above-mentioned fenoxycarb, cyromazine, naphthalene sulfonate, alkylphenol resin polyoxyethylene ether sulfate, polycarboxylate, starch, and diatomaceous earth, and extrude and granulate to make a water-dispersible granule containing 30% by weight of the insecticidal composition.

[0101] Example 9

[0102] This example first provides an insecticide composition composed of 200 g of fenoxycarb and 40 g of cyromazine.

[0103] This example further provides an insecticidal preparation (water-dispersible granule), and its formula is as follows:

[0104] 200 g of fenoxycarb, 40 g of cyromazine, 90 g of naphthalene sulfonate, 50 g of lignosulfonate, 40 g of polycarboxylate, 70 g of starch, and kaolin to make up 1000 g.

[0105] The preparation method of the insecticidal preparation comprises the following steps:

[0106] Mix and pulverize the above-mentioned fenoxycarb, cyromazine, naphthalene sulfonate, lignosulfonate, polycarboxylate, starch, and kaolin, and extrude and granulate to make a water-dispersible granule containing 24% by weight of the insecticidal composition.

[0107] Example 10

[0108] This example provides an insecticide composition and an insecticidal preparation, and the difference from Example 1 is only that: the mass ratio of fenoxycarb to cyromazine in the insecticide composition is 10:1.

[0109] Example 11

[0110] This example first provides an insecticide composition composed of 200 g of fenoxycarb and 10 g of cyromazine.

[0111] This example further provides an insecticidal preparation (suspension agent), and its formula is as follows:

[0112] 200 g of fenoxycarb, 10 g of cyromazine, 80 g of naphthalene sulfonate, 60 g of block polyether, 60 g of polycarboxylate, 50 g of propylene glycol, and water to make up 1000 g.

[0113] The preparation method of the insecticidal preparation comprises the following steps:

[0114] Mix the above-mentioned fenoxycarb, cyromazine, naphthalene sulfonate, block polyether, polycarboxylate, starch, propylene glycol, water, etc. evenly, grind and crush them to a fine degree, and add xanthan gum to make a suspending agent containing 21% by weight of the insecticidal composition.

[0115] Example 12

[0116] This example provides an insecticide composition and an insecticidal preparation, the difference from Example 1 being only that: the mass ratio of fenoxycarb to cyromazine in the insecticide composition is 30:1.

[0117] Example 13

[0118] This example first provides an insecticide composition composed of 200 g of fenoxycarb and 10 g of cyromazine.

[0119] This example further provides an insecticidal preparation (emulsion in water), and its formulation is as follows:

[0120] 200 g of fenoxycarb, 5 g of cyromazine, 60 g of castor oil polyoxyethylene ether (40) (emulsifier), 50 g of calcium dodecylbenzenesulfonate, 200 g of solvent oil, and water is made up to 1 kg;

[0121] The preparation method of the insecticidal preparation includes the following steps:

[0122] Mix the above-mentioned weights of fenoxycarb, cyromazine, castor oil polyoxyethylene ether (40), calcium dodecylbenzenesulfonate, and solvent oil into a uniform oil phase; add the oil phase to water and shear and emulsify to obtain an emulsion in water containing 20.5% by weight of the insecticidal composition.

[0123] Example 14

[0124] This example first provides an insecticide composition and an insecticidal preparation, the difference from Example 1 being only that: the insecticide composition is composed of 3 g of fenoxycarb and 201 g of cyromazine.

[0125] Comparative Example 1

[0126] This comparative example provides an insecticidal composition, which is cyromazine technical; this comparative example further provides an insecticidal preparation, which is a cyromazine water dispersible granule with an active ingredient content of 80%.

[0127] Comparative Example 2

[0128] This comparative example provides an insecticidal composition, which is fenoxycarb technical; this comparative example further provides an insecticidal preparation, which is a fenoxycarb suspending agent with an active ingredient content of 250 g / L.

[0129] Test Example

[0130] 1. Indoor combined effect determination test of the insecticidal compositions in the examples and comparative examples.

[0131] Test object: Bradysia odoriphaga (Yang et Zhang).

[0132] Pharmaceutical preparation: The cyromazine technical in Comparative Example 1 was dissolved with appropriate deionized water, and the fenoxycarb technical in Comparative Example 2 was dissolved with appropriate acetone. The required mother liquor concentration was prepared with 0.1% triton x-100 aqueous solution for standby.

[0133] Test method: Two qualitative filter papers were laid flat on the bottom of the petri dish. Twenty active and healthy 4th instar larvae were picked and placed on one side of the filter paper. 0.6 mL of the liquid medicine was slowly dropped on the surface of the insects, and then 1.4 mL of the liquid medicine with the corresponding concentration was dispersed and dropped on the filter paper around the insects. Two 2-cm-long false stems of Chinese chives were immersed in the test liquid medicine for 20 s, air-dried and placed about 1 cm near the larvae. Each treatment was repeated 3 times. After treatment, the test insects were placed in a lightless incubator at 27 ± 1°C and a humidity of 70% - 80%. Moisture was checked and supplemented every day to keep the humidity appropriate. When the medicated false stems of Chinese chives were eaten up, the non-medicated false stems of Chinese chives were fed, and the same length and amount of false stems of Chinese chives were added every day between the medicines and repetitions. The treatment with the solvent without active ingredients was used as the blank control. Observation was carried out until pupation. When the larvae pupated, the pupae were picked out, the deformed pupae were carefully observed, and the number of deformed pupae was recorded (defaulted as the number of dead insects).

[0134] Calculation of mortality and corrected mortality: The virulence regression equation and LC50 value were obtained using SPSS data processing software, and the co-toxicity coefficient (CTC value) of the mixture was calculated according to the Sun Yunpei method.

[0135] Among them, the corrected mortality was calculated according to the following formula, with the unit of percentage (%), and the calculation result was reserved to two decimal places:

[0136] Mortality = number of dead insects / total number of treated insects × 100

[0137] Corrected mortality = treatment mortality / blank control mortality × 100

[0138] If the control mortality < 5%, no correction is required; if the control mortality is between 5% and 20%, the correction should be carried out according to the corrected mortality formula; if the control mortality > 20%, the test needs to be redone.

[0139] Analysis was carried out using the Statistical Analysis System (SPSS) to calculate the LC 50 value and its 95% confidence limit. According to the Sun Yunpei method: the co-toxicity coefficient (CTC) of the mixture ≥ 120 indicates a synergistic effect, (CTC) ≤ 80 indicates an antagonistic effect, and 80 < CTC < 120 indicates an additive effect.

[0140] The toxicity index (TIA) of single agent A. If agent A is taken as the reference, the toxicity index of A is regarded as 100, and the toxicity index of agent B is: Toxicity index of B (TIB) = (LC of A 50 / LC of B 50 ) × 100;

[0141] Actual measured toxicity index of the mixed agent (ATI) = [LC of agent A 50 / LC of the (A + B) mixed agent 50 × 100;

[0142] Theoretical toxicity index (TTI) = Toxicity index of agent A (TIA) × Mass percentage content of agent A in the mixed agent + Toxicity index of agent B (TIB) × Mass percentage content of agent B in the mixed agent;

[0143] Coefficient of co - toxicity (CTC) = [(Actual measured toxicity index of the (A + B) mixed agent (ATI) / Theoretical toxicity index of the (A + B) mixed agent (TTI))] × 100;

[0144] Table 1 Results of the determination of the combined action of the insecticide composition against Bradysia odoriphaga indoors

[0145]

[0146]

[0147] As can be seen from Table 1, the LC 50 values of fenoxycarb and cyromazine against Bradysia odoriphaga are 15.62 mg / L and 8.45 mg / L respectively. When the mass ratio of fenoxycarb to cyromazine is in the range of 1:40 to 1:40, the coefficient of co - toxicity is greater than 120, showing a synergistic effect. Especially when the mass ratio of fenoxycarb to cyromazine is close to 1:1, that is, in the range of 1:5 to 1:5, the synergistic effect is the greatest. When the mass ratio of fenoxycarb to cyromazine is 1:67, the coefficient of co - toxicity is 111.89, showing an additive effect. The test results show that the compound of fenoxycarb and cyromazine has high activity against Bradysia odoriphaga, and shows an obvious synergistic effect within the mass ratio range of 1:40 to 1:40.

[0148] 2. The present invention further verifies the control effect of the insecticidal preparations in the examples and comparative examples against Bradysia odoriphaga.

[0149] This test was carried out in Zhaoquanying Town, Shunyi District, Beijing. A field test for controlling Bradysia odoriphaga (Bradysia diffusa) was carried out using the examples and comparative examples.

[0150] A total of 12 agent treatments were set in the test, with 4 replicates for each treatment.

[0151] Application method: Root irrigation. That is, at the initial stage of the emergence of Bradysia odoriphaga, according to the dosage in Table 2, 250 liters of water is mixed per mu and evenly poured on the rhizomes of Chinese chives, and then sufficient water is poured.

[0152] Investigation: Check once before applying the medicine and on the 3rd day, 7th day, 14th day, 21st day, and 60th day after root irrigation. Dig out 5 clumps of Chinese chives in the central area of the plot, count the number of live maggots inside and outside the bulbs, and investigate the number of surviving insect populations. Table 2 shows the calculation results of the control effect.

[0153] Reference criterion GB / T 17980.67 - 2004: Guidelines for field efficacy trials of pesticides (Part 2) - Section 67: Insecticides for controlling Bradysia odoriphaga and root maggots of Chinese chives.

[0154] Table 2 Field trial results of insecticidal preparations for controlling Bradysia odoriphaga of Chinese chives

[0155]

[0156] As can be seen from this table, the insecticidal preparation described in the embodiment of the present invention has good quick-acting property and long-lasting period in the field control effect after root irrigation, which are significantly better than the control effects of single agents; the effect is significantly better than the control effects of single agents. At the same time, in the insecticidal composition described in the embodiment of the present invention, by compounding fenoxycarb and cyromazine, no phytotoxicity is found in Chinese chives.

[0157] In summary, using the insecticidal composition and insecticidal preparation provided by the present invention to control Bradysia odoriphaga can not only improve the control effect of pests, but also significantly reduce the dosage of the medicine and is safe for Chinese chives.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An insecticidal composition, characterized in that it comprises fenoxycarb and cyromazine in a mass ratio of 1 - 80:1 - 80.

2. The insecticidal composition according to claim 1, characterized in that the insecticidal composition comprises fenoxycarb and cyromazine in a mass ratio of 1 - 40:1 - 40.

3. The insecticidal composition according to claim 1 or 2, characterized in that the insecticidal composition comprises fenoxycarb and cyromazine in a mass ratio of 1 - 5:1 - 5.

4. Use of the insecticidal composition according to any one of claims 1 - 3 in the preparation of an insecticidal preparation.

5. An insecticidal preparation, characterized in that it contains the insecticidal composition according to any one of claims 1 - 3.

6. The insecticidal preparation according to claim 5, characterized in that it comprises the insecticidal composition and a carrier; in the insecticidal preparation, the dosage of the insecticidal composition is 5 - 80 wt%.

7. Use of the insecticidal composition according to any one of claims 1 - 3 or the insecticidal preparation according to claim 5 or 6 in the control of crop pests.

8. The use according to claim 7, characterized in that the crops include Chinese chives, garlic or scallions.

9. The use according to claim 7 or 8, characterized in that the pests are dipteran pests; preferably, the dipteran pests include Bradysia odoriphaga.

10. The use according to any one of claims 7 - 9, characterized in that the method of using the insecticidal composition comprises: at the initial stage of pest occurrence, irrigating the roots after diluting with water at a dosage of 60 - 120 g of the insecticidal composition per mu of crops.

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