An emulsifiable concentrate containing bifenthrin and nitenpyram, and its preparation method and application

Abstract

The invention belongs to the field of pesticide insecticide technology and relates to an emulsifiable concentrate containing bifenthrin and nitenpyram and its preparation method and application. The emulsifiable concentrate is composed of the following weight percentage components: bifenthrin 1-50%, nitenpyram 1-50%, emulsifier 1-30%, wetting and penetrating agent 1-15%, and the balance is a composite solvent; the composite solvent is composed of a sulfur-containing solvent, an ester and ether ester solvent, and an aromatic solvent, and the weight ratio of the sulfur-containing solvent, the ester and ether ester solvent, and the aromatic solvent is (1-2): (1-5): (1-8). The emulsifiable concentrate preparation component system containing bifenthrin and nitenpyram of the present invention is reasonable, the degradation rate of nitenpyram and bifenthrin is low, the emulsifying effect is good, and the low-temperature stability and heat storage stability are good, and the preventive effect on multiple target pests is remarkable.

Description

Technical Field

[0001] The present invention relates to the technical field of pesticide compounding, and in particular to an emulsifiable concentrate containing bifenthrin and nitenpyram, and a preparation method and application thereof. Background Art

[0002] Emulsifiable concentrates (ECs) are one of the most basic pesticide formulations. They are prepared by dissolving the pesticide technical in a specific proportion in an organic solvent and adding a specific amount of emulsifier to create a uniform, transparent, oily liquid. These liquids form a relatively stable emulsion when mixed with water. ECs offer excellent stability, simple processing, and minimal equipment requirements, making them easy to process. EC application technology is simple and convenient. Practice has proven that, when the same pesticide technical is processed into different formulations, ECs offer the highest efficacy at the same dosage.

[0003] Bifenthrin, CAS No.: 82657-04-3, molecular formula: C 23 H 22 ClF3O2, chemically known as 2-methylbiphenyl-3-ylmethyl (Z)-(1RS,3RS)-3-(2-chloro-3,3,3-trifluoropropene-1-yl)-2,2-dimethylcyclopropanecarboxylate, is a cypermethrin-based insecticide and acaricide. It primarily acts as a contact and stomach toxicant, with no systemic effects. Bifenthrin is a sodium channel modulator that primarily acts on the insect nervous system, maintaining patency of sodium channels and causing excessive excitement and death.

[0004] Nitenpyram, CAS No.: 150824-47-8, molecular formula: C 11 H 15 ClN₄O₂, chemically known as (E)-N-(6-chloro-3-pyridylmethyl)-N-ethyl-N′-methyl-2-nitrovinylidenediamine, is a competitive modulator of nicotinic acetylcholine receptors (nAChRs). It exhibits contact, stomach, systemic, and osmotic effects. It primarily acts on insect nerves, binding to the acetylcholine site on the receptor, inhibiting acetylcholinesterase activity. Following spontaneous discharge, it widens the diaphragm potential difference and reduces synaptic diaphragm stimulation, leading to a complete loss of stimulation of the nerve's axonal diaphragm potential channel. This has a neuroblocking effect on insect axonal synaptic receptors, paralyzing and killing the pests. It is widely used in agriculture and horticulture, including rice, fruit trees, vegetables, and tea, to control aphids, rice planthoppers, whiteflies, leafhoppers, thrips, and other pests. It boasts a broad insecticide spectrum, a unique mode of action, and long-lasting efficacy.

[0005] The decomposition rate of pesticide active ingredients is a key technical indicator for evaluating the stability of compound pesticide formulations. The appearance and efficacy of a pesticide formulation also largely depend on the decomposition rate, or in other words, the stability, of the active ingredients. Current pesticide products generally require a decomposition rate of less than 5%. However, finding stable conditions suitable for the coexistence of compound pesticide active ingredients while avoiding significant decomposition is extremely difficult. Summary of the Invention

[0006] Based on the above situation, the purpose of the present invention is to provide an emulsifiable concentrate containing bifenthrin and nitenpyram, and its preparation method and application, which are mainly used for controlling crop pests. The emulsifiable concentrate has a reasonable component system, a low decomposition rate of the active ingredients of the pesticides, a good emulsification effect, good low-temperature stability and heat storage stability, good control effects on a variety of target pests, and can delay the development of pest resistance.

[0007] To achieve the above object, the present invention provides an emulsifiable concentrate containing bifenthrin and nitenpyram and its application, wherein the emulsifiable concentrate is composed of the following components in weight percentage: 1-50% bifenthrin, 1-50% nitenpyram, 1-30% emulsifier, 1-30% wetting and penetrating agent, and the balance is a composite solvent;

[0008] Furthermore, the emulsifiable concentrate is composed of the following components in weight percentage: 5-40% of bifenthrin, 5-30% of nitenpyram, 1-15% of emulsifier, 5-15% of wetting and penetrating agent, and the balance is a composite solvent;

[0009] Furthermore, the percentage of bifenthrin in the emulsifiable concentrate is 10%, and the percentage of nitenpyram is 15%;

[0010] Furthermore, the composite solvent is composed of a sulfur-containing solvent, an ester and ether ester solvent, and an aromatic hydrocarbon solvent; the ester and ether ester solvent include one or more of propylene carbonate, ethylene carbonate, diethyl carbonate, dimethyl carbonate, methyl ethyl carbonate, propylene glycol methyl ether acetate, ethylene glycol tert-butyl ether, and propylene glycol methyl ether; the aromatic hydrocarbon solvent includes one or more of xylene, trimethylbenzene, and tetramethylbenzene;

[0011] Furthermore, the ester and ether ester solvents include one or more of propylene carbonate, ethylene carbonate, ethylene glycol tert-butyl ether, and propylene glycol methyl ether acetate;

[0012] Furthermore, the weight ratio of the sulfur-containing solvent, propylene carbonate, and aromatic hydrocarbon solvent is (1-2):(1-5):(1-8);

[0013] The weight ratio of the sulfur-containing solvent, propylene carbonate, and aromatic hydrocarbon solvent is (1-2):(1-4):(1-6);

[0014] Furthermore, the weight ratios of the sulfur-containing solvent, ester and ether ester solvent, and aromatic hydrocarbon solvent in the composite solvent are 1:5:2, 1:1:1, 1:2:5, and 1:2:2;

[0015] Furthermore, the weight ratio of the sulfur-containing solvent, the ester and ether-ester solvent, and the aromatic hydrocarbon solvent in the composite solvent is 1:2:2;

[0016] Furthermore, the emulsifier is selected from one or more of polyarylphenol polyoxyethylene ether, ethylene oxide-propylene oxide block polyether, and calcium dodecylbenzenesulfonate;

[0017] Furthermore, the wetting and penetrating agent is selected from one or more of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, alkanolamide polyoxyethylene ether, alkyl polyoxyethylene ether succinate sulfonate, and isomeric tridecanol polyoxyethylene ether;

[0018] Furthermore, the sulfur-containing solvent is dimethyl sulfoxide;

[0019] Application of an emulsifiable concentrate containing bifenthrin and nitenpyram in preventing and controlling agricultural, forestry and gardening pests;

[0020] Furthermore, the pests are Hemiptera, Thysanoptera, and Lepidoptera pests;

[0021] The Hemiptera pests include: Acrosternum hilare (green stink bug), Blissus leucopterus (chinch bug), Calocoris norvegicus, Acrosternum hilare (green stink bug), Blissus leucopterus (chinch bug), Calocoris norvegicus, (aphids, scales, whiteflies, leafhoppers), Acrythosiphon pisum (pea aphid), Adelges spp., Aleurodes proletella, Aleurodicus disperses), Aleurothrixus floccosus (wooly whitefly), Aluacaspis spp., Aonidiella aurantii, Aphis spp., Aphis gossypii (cotton aphid), Aphis pomi, Aulacorthum solani (foxglove aphid), Bemisia spp. (whitefly), Bemisia argentifolii, Bemisia tabaci (sweet potato whitefly), Brachycolus noxius, Brachycorynella asparagi (asparagus aphid), Brevennia rehi, Brevicoryne brassicae), Ceroplastes spp., Ceroplastes rubens (red wax scale), Chionaspis spp., Chrysomphalus spp., Dysaphis plantaginea (rosy apple aphid), Empoasca spp.), Eriosomalanigerum (apple cotton aphid), Icerya purchasi (cottony cushion scale), Idioscopus nitidulus (mango leafhopper), Laodelphaxstriatellus (lime planthopper), Lepidosaphes spp., Macrosiphum spp., Macrosiphum euphorbiae, Macrosiphum granarium, Macrosiphum rosae (rose aphid), Macrosteles quadrilineatus (aster leafhopper), Mahanarva frimbiolata, Metopolophium dirhodum, Mictis longicornis, Myzus spp., Myzus persicae (green peach aphid), aphid), Nephotettix spp., Nephotettix cinctipes (green leafhopper), Nilaparvata lugens, Parlatoria pergandii, Peregrinus maidis (corndelphacid), Philaenus spp., Phylloxeravitifoliae (grape phylloxera), Physokermes piceae (spruce bud scale), Planococcus spp. (mealybugs), Pseudococcus spp. (mealybugs), Pseudococcus brevipes (pineapple mealybugs), mealybug), Quadraspidiotus perniciosus (San Josescale), Rhopalosiphum spp.), Rhopalosiphum maida (corn leaf aphid), Rhapalosiphum padi (oat bird-cherry aphid), Saissetia spp., Saissetia oleae, Schizaphis graminum (greenbug), Sitobion avenae (English grain aphid), Sogatella furcifera, Therioaphis spp., Toumeyella spp., Trialeurodes spp., and Trialeurodes vaporariorum;

[0022] The Thysanoptera pests include: Frankliniella fusca (tobacco thrips), Frankliniella occidentalis (western flower thrips), Frankliniella shultzei, Frankliniella williamsi (cornthrips), Heliothrips haemorrhaidalis (greenhouse thrips), Riphiphorothrips cruentatus, Scirtothrips spp., Scirtothrips citri (citrus thrips), Scirtothrips dorsalis (yellow tea thrips), Taeniothrips rhopalantennalis, and Thrips spp.;

[0023] The Lepidoptera pests include: Adoxophyes spp., Adoxophyes orana, Agrotis spp. (cutworms), Agrotis ipsilon (black cutworm), Alabama argillacea (cotton leafworm), Amorbia cuneana, Amyelosis transitella (navelorangeworm), Anacamptodes defectaria, Anarsia lineatella (peach twig borer), Anomis sabulifera (jute looper), Anticarsia g emma talis, Archips argyrospila (fruittree leafroller), Archips argyrospila (rose leafroller), and A. rosana (rose leaf roller), Argyrotaenia spp. (tortricid moths), Argyrotaenia citrana (orange tortrix), Autographa gamma, Bonagota cranaodes, Borbo cinnara (rice leaf folder), Bucculatrix thurberiella (cotton leaf perforator), Caloptilia spp. (leaf miners), Capua reticulana, Carposina niponensis (peach fruit moth), Chilo spp., Chlumetia transversa (mango shoot borer), Choristoneura rosaceana (obliquebanded rose leaf roller), leafroller)), Chrysodeixis spp.), Cnaphalocerus medinalis (grass leafroller), Colias spp., Conpomorpha cramerella, Cossus cossus (carpenter moth), Crambus spp. (sod webworms), Cydia funebrana (plum fruit moth), Cydia molesta (oriental fruit moth), Cydia nignicana (pea moth), Cydia pomonella (codling moth), Darna diducta, Diaphania spp. (stem borer), borers), Diatraea spp. (stalk borers), Diatraea saccharalis (sugarcane borer), Diatraea graniosella (southwester corn borer), Earias spp. (cotton bollworm), Earias insulata (Egyptian bollworm), Earias vitella (rough northern bollworm), Ecdytopopha aurantianum, Elasmopalpus lignosellus (lesser cornstalk borer), Epiphysias postruttana (light brown apple moth), Ephestia spp. (flour moths), Ephestia cautella) (almond moth), Ephestia elutella (tobbacomoth), Ephestia kuehniella (Mediterranean flour moth), Epimeces spp.), Epinotia aporema, Erionotathrax (banana skipper), Eupoecilia ambiguella (grapeberry moth), Euxoa auxiliaris (army cutworm), Feltia spp. (cutworms), Gortyna spp. (stemblerers), Grapholitamolesta (oriental fruit moth), Hedylepta indicate (bean leaf webber), Helicoverpa spp. (snottle moths), Helicoverpa armigera, Helicoverpa zea, Heliothis spp., Heliothis budworm ( virescens), Hellula undalis (cabbage webworm), Indarbela spp. (root borers), Keiferia lycopersicella (tomato borer), Leucinodes orbonalis (eggplant borer), Leucoptera malifoliella (moth), Lithocollectis spp. (grape fruit moth), Lobesia botrana (grape fruit moth), Loxagrotis spp. (grape fruit moth), Loxagrotis albicosta (western bean cutworm), Lymantria dispar (gypsy moth), Lyonetia clerkella (apple leaf miner), Mahasena corbetti (oil palm bagworm), bagworm) and Malacosoma spp.) (tent caterpillars), Mamestra brassicae (cabbage armyworm), Maruca testulalis (bean pod borer), Metisa plana (bagworm), Mythimna unipuncta (true armyworm), Neoleucinodes elegantalis, Nymphula depunctalis (three-spotted water borer), Operophtherabrumata (winter looper), Ostrinia nubilalis (European corn borer), Oxydia vesulia, Pandemis cerasana (common currant tortrix), Pandemis heparana (brown apple tortrix), Papilio demodocus (African swallowtail), Pectinophora gossypiella (pink bollworm), (Bollworm), Peridroma species (pp.), Peridroma saucia (variegated cutworm), Perileucoptera coffeella (white coffee leafminer), Phthorimaea operculella (potato tuber moth), Phyllocnisitis citrella, Phyllonorycter spp., Pieris rapae, Plathypena scabra, Plodia interpunctella, Plutellaxylostella (diamondback moth), Polychrosis viteana (grapeberry moth), Prays endocarpa, Prays olive moth oleae) (olive moth), Pseudaletia spp.) (spodoptera), Pseudaletia unipunctata (armyworm), Pseudoplusia includes (, Rachiplusia nu), Scirpophaga incertulas, Sesamia spp. (stemborers), Sesamia inferens (pink rice stem borer), Sesamia nonagrioides, Setora nitens, Sitotroga cerealella (Angoumois grain moth), Sparganothis pilleriana, Spodoptera spp., Spodoptera exigua, Spodoptera fugiperda, Spodoptera oridania (southern armyworm), Synanthedon spp., Thecla basilides, Thermisia gemmatalis, Tineola bisselliella (webbing clothes moth), Trichoplusia ni (cabbage worm), and Tuta absoluta;

[0024] Furthermore, the Hemiptera pests are tea green leafhoppers, rice planthoppers, aphids, and whiteflies; the Thysanoptera pests are thrips; and the Lepidoptera pests are peach borer and cotton bollworm.

[0025] Furthermore, the Hemiptera pests are tea green leafhoppers, rice planthoppers, and aphids.

[0026] The present invention also discloses a method for preparing an emulsifiable concentrate containing bifenthrin and nitenpyram: adding measured bifenthrin, nitenpyram, a wetting and penetrating agent, and a composite solvent into a mixing kettle to dissolve them, then adding an emulsifier, supplementing the amount with the composite solvent, stirring evenly, and filtering to obtain the emulsifiable concentrate;

[0027] Beneficial effects of the present invention:

[0028] 1) The compound of bifenthrin and nitenpyram of the present invention has different mechanisms of action, can expand the insecticide spectrum, has good control effects on multiple target pests, and can delay the development of pest resistance.

[0029] 2) The present invention screens out a specific composite solvent, and the bifenthrin and nitenpyram emulsifiable concentrate prepared using the composite solvent can be automatically dispersed in water with qualified stability, thereby forming a stable condition suitable for the coexistence of bifenthrin and nitenpyram, and significantly reducing the degradation rate of the active ingredients.

[0030] 3) The composite solvent of the present invention has good compatibility with bifenthrin and nitenpyram, and the emulsifiable concentrate of bifenthrin and nitenpyram prepared using the composite solvent has a relatively significant synergistic effect. DETAILED DESCRIPTION

[0031] To make the technical solutions and advantages of the present invention more clear, they are described in detail below with reference to specific embodiments. Specific embodiments

[0033] According to the formulations of the preparation example and the control example, 25% bifenthrin·nitenpyram emulsifiable concentrate (2:3) was prepared.

[0034] Preparation Example 1

[0035] The emulsifiable concentrate of bifenthrin and nitenpyram is composed of the following components: 10% of bifenthrin, 15% of nitenpyram, 4.5% of polyoxyethylene polyphenol ether, 10% of fatty alcohol polyoxyethylene ether, and the balance is made up of a composite solvent.

[0036] The weight ratio of the sulfur-containing solvent, esters and ether esters, and aromatic hydrocarbon solvents in the composite solvent is 1:5:2, wherein the sulfur-containing solvent is dimethyl sulfoxide, the ester and ether ester solvents are propylene carbonate, and the aromatic hydrocarbon solvent is xylene.

[0037] Preparation method: add the measured bifenthrin, nitenpyram, solvent and wetting penetrant into a mixing kettle and stir to dissolve them, then add emulsifier and composite solvent to make up the balance, stir evenly in a blender, and filter to obtain the desired emulsifiable concentrate of the present invention.

[0038] Preparation Example 2

[0039] The emulsifiable concentrate of cypermethrin and nitenpyram is composed of the following components: 10% of cypermethrin, 15% of nitenpyram, 2% of calcium dodecylbenzenesulfonate, 12% of alkylphenol polyoxyethylene ether, and the balance made up of a composite solvent.

[0040] The weight ratio of the sulfur-containing solvent, esters and ether esters, and aromatic hydrocarbon solvents in the composite solvent is 1:1:1, wherein the sulfur-containing solvent is dimethyl sulfoxide, the ester and ether ester solvents are ethylene carbonate, and the aromatic hydrocarbon solvent is trimethylbenzene.

[0041] Preparation method: Same as Preparation Example 1.

[0042] Preparation Example 3

[0043] The emulsifiable concentrate of bifenthrin and nitenpyram is composed of the following components: 10% of bifenthrin, 15% of nitenpyram, 5% of ethylene oxide-propylene oxide block polyether, 12% of isotridecyl alcohol polyoxyethylene ether, and the balance is made up of a composite solvent.

[0044] The weight ratio of the sulfur-containing solvent, esters and ether esters, and aromatic hydrocarbon solvents in the composite solvent is 1:2:5, wherein the sulfur-containing solvent is dimethyl sulfoxide, the ester and ether ester solvents are propylene glycol methyl ether acetate, and the aromatic hydrocarbon solvent is tetramethylbenzene.

[0045] Preparation method: Same as Preparation Example 1.

[0046] Preparation Example 4

[0047] The emulsifiable concentrate of bifenthrin and nitenpyram is composed of the following components: 10% of bifenthrin, 15% of nitenpyram, 4.5% of polyoxyethylene polyphenol ether, 10.5% of fatty alcohol polyoxyethylene ether, and the balance is made up of a composite solvent.

[0048] The weight ratio of the sulfur-containing solvent, esters and ether esters, and aromatic hydrocarbon solvents in the composite solvent is 1:2:2, wherein the sulfur-containing solvent is dimethyl sulfoxide, the ester and ether ester solvents are ethylene glycol tert-butyl ether, and the aromatic hydrocarbon solvent is trimethylbenzene.

[0049] Preparation method: Same as Preparation Example 1.

[0050] In order to further illustrate the beneficial effects of the present invention, a related control example was set up based on the emulsifiable concentrate of bifenthrin and nitenpyram in Preparation Example 4.

[0051] Comparative Example 1

[0052] The emulsifiable concentrate of cypermethrin and nitenpyram is composed of the following components: 10% of cypermethrin, 15% of nitenpyram, 4.5% of polyoxyethylene polyphenol ether, 10.5% of fatty alcohol polyoxyethylene ether, and the balance made up of trimethylbenzene.

[0053] Comparative Example 2

[0054] The emulsifiable concentrate of cypermethrin and nitenpyram is composed of the following components: 10% of cypermethrin, 15% of nitenpyram, 4.5% of polyoxyethylene polyphenol ether, 10.5% of fatty alcohol polyoxyethylene ether, and the balance made up of dimethyl sulfoxide.

[0055] Comparative Example 3

[0056] The emulsifiable concentrate of cypermethrin and nitenpyram is composed of the following components: 10% of cypermethrin, 15% of nitenpyram, 4.5% of polyoxyethylene polyphenol ether, 10.5% of fatty alcohol polyoxyethylene ether, and the balance of ethylene glycol tert-butyl ether.

[0057] Comparative Example 4

[0058] The emulsifiable concentrate of bifenthrin and nitenpyram is composed of the following components: 10% of bifenthrin, 15% of nitenpyram, 4.5% of polyoxyethylene polyphenol ether, 10.5% of fatty alcohol polyoxyethylene ether, and the balance is made up of a composite solvent.

[0059] The composite solvent consists of dimethyl sulfoxide and ethylene glycol tert-butyl ether, and the mass ratio of the dimethyl sulfoxide to the ethylene glycol tert-butyl ether is 1:2.

[0060] Comparative Example 5

[0061] The emulsifiable concentrate of bifenthrin and nitenpyram is composed of the following components: 10% of bifenthrin, 15% of nitenpyram, 4.5% of polyoxyethylene polyphenol ether, 10.5% of fatty alcohol polyoxyethylene ether, and the balance is made up of a composite solvent.

[0062] The composite solvent consists of dimethyl sulfoxide and trimethylbenzene, and the mass ratio of the dimethyl sulfoxide to trimethylbenzene is 1:2.

[0063] Comparative Example 6

[0064] The emulsifiable concentrate of bifenthrin and nitenpyram is composed of the following components: 10% of bifenthrin, 15% of nitenpyram, 4.5% of polyoxyethylene polyphenol ether, 10.5% of fatty alcohol polyoxyethylene ether, and the balance is made up of a composite solvent.

[0065] The composite solvent consists of ethylene glycol tert-butyl ether and trimethylbenzene, and the mass ratio of the ethylene glycol tert-butyl ether to the trimethylbenzene is 1:1.

[0066] Comparative Example 7

[0067] The emulsifiable concentrate of bifenthrin and nitenpyram is composed of the following components: 10% of bifenthrin, 15% of nitenpyram, 4.5% of polyoxyethylene polyphenol ether, 10.5% of fatty alcohol polyoxyethylene ether, and the balance is made up of a composite solvent.

[0068] The composite solvent consists of trimethylbenzene and methanol, wherein the mass ratio of trimethylbenzene to methanol is 1:2.

[0069] Comparative Example 8

[0070] The emulsifiable concentrate of bifenthrin and nitenpyram is composed of the following components: 10% of bifenthrin, 15% of nitenpyram, 4.5% of polyoxyethylene polyphenol ether, 10.5% of fatty alcohol polyoxyethylene ether, and the balance is made up of a composite solvent.

[0071] The composite solvent consists of trimethylbenzene and cyclohexanone, wherein the mass ratio of trimethylbenzene to cyclohexanone is 1:2.

[0072] Comparative Example 9

[0073] The emulsifiable concentrate of bifenthrin and nitenpyram is composed of the following components: 10% of bifenthrin, 15% of nitenpyram, 4.5% of polyoxyethylene polyphenol ether, 10.5% of fatty alcohol polyoxyethylene ether, and the balance is made up of a composite solvent.

[0074] The composite solvent consists of trimethylbenzene and DMF, wherein the mass ratio of trimethylbenzene to DMF is 1:2.

[0075] The preparation method of the above control example is the same as that of Preparation Example 1.

[0076] Determination of main performance indicators

[0077] 1. The main performance indicators of the bifenthrin and nitenpyram emulsifiable concentrates of the above-mentioned preparation examples and control examples were measured. The specific test data are shown in Table 1.

[0078] (1) Determination of emulsion stability: refer to GB / T 1603-2001 “Determination of stability of pesticide emulsions”.

[0079] (2) Storage stability determination method: refer to GB / T 19136-2021 “Determination of thermal storage stability of pesticides” and GB / T 19137-2003 “Determination of low temperature stability of pesticides”.

[0080] (3) Determination of emulsification and dispersibility: Prepare standard hard water. Use a syringe to slowly add 1 mL of emulsifiable concentrate to a beaker containing standard hard water at a height of 2 cm above the water surface. Observe the natural dispersion and emulsification of the emulsifiable concentrate in the water.

[0081] Emulsification and dispersibility evaluation method:

[0082] Judgment Mark Dispersed state Emulsified state Level 1 Can quickly and automatically disperse evenly A little stirring will turn it into a blue or light white transparent emulsion Level 2 Can automatically disperse evenly A little stirring will turn it into a blue translucent emulsion Level 3 Dispersed in white cloud A blue opaque emulsion appears after slight stirring Level 4 White granular sinking A white opaque emulsion appears after slight stirring Level 5 Sinking in the form of oil droplets It can emulsify when stirred and separate quickly after stopping stirring

[0083] Table 1 Main performance indicators of bifenthrin and nitenpyram emulsifiable concentrates

[0084]

[0085] As can be seen from Table 1, the present invention's bifenthrin and nitenpyram emulsifiable concentrate preparation examples utilize appropriate composite solvents and ratios, resulting in a rational system, excellent emulsification and dispersion properties, and satisfactory performance indicators, all exceeding those of the control examples. The active ingredients of the pesticides in the control examples 1-6 were not fully dissolved, and qualified emulsifiable concentrate preparations could not be produced.

[0086] 2. The degradation rates of the emulsifiable concentrates of the above-mentioned preparation examples 1-4 and control examples 7-9, which were compounded with bifenthrin and nitenpyram, were determined. The test indicators are shown in Table 2.

[0087] Table 2 Degradation rate and other indexes of bifenthrin and nitenpyram emulsifiable concentrate

[0088]

[0089] As shown in Table 2, the emulsifiable concentrates of bifenthrin and nitenpyram prepared in Examples 1-4, which utilize a reasonable composite solvent, have degradation rates significantly lower than those of Control Examples 7-9.

[0090] Field efficacy trials

[0091] Field efficacy test 1 Field control test of bifenthrin and nitenpyram emulsifiable concentrate against tea green leafhopper

[0092] Test subjects: Tea green leafhopper.

[0093] Experimental crop: tea tree.

[0094] Experimental location: tea garden in Futailing Village, Tianheng Town, Jimo City, Qingdao City, Shandong Province.

[0095] Experimental conditions: The cultivation conditions of all experimental plots were uniform and consistent with local agricultural cultivation practices (GAP).

[0096] The experimental plots were arranged in random blocks, with protection rows set between adjacent plots. The plot area was 30m 2 , and repeat 4 times. When the number of tea green leafhopper nymphs reaches more than 10 on the leaves, the control example and the preparation example are diluted with water and sprayed, and the medicine is applied once.

[0097] Survey method: Before spraying, randomly survey 5 points in each plot, 1m per point. 2 , investigate the number of leafhoppers at each point, and the investigation time should be completed before 8:30 in the morning. Investigate the base number of insect population before spraying, and investigate the number of residual insects 3d and 15d after spraying. In total, investigate 3 times, and calculate the insect population reduction rate and prevention effect.

[0098] During the experiment, the tea trees in each treatment group grew well, and no phytotoxicity was observed in any treatment group.

[0099] Field efficacy calculation method:

[0100]

[0101]

[0102] The results of the field efficacy test are shown in Table 3.

[0103] Table 3 Field control effect of the emulsifiable concentrate of bifenthrin and nitenpyram on tea green leafhopper

[0104]

[0105] As can be seen from the field efficacy test results in Table 3, the compounded emulsifiable concentrate preparations of the present invention have a good control effect on tea green leafhoppers. The control effect of the compounded emulsifiable concentrates of bifenthrin and nitenpyram in Preparation Examples 1-4 on tea green leafhoppers is significantly better than that of Control Examples 7-9, and the control efficacy 15 days after application is greater than 88%.

[0106] Field efficacy test 2 Field efficacy test of emulsifiable concentrate of bifenthrin and nitenpyram against rice planthoppers

[0107] Test target: Rice planthopper.

[0108] Experimental crops: rice.

[0109] Experimental location: Wujiabao rice planting base, Huaiyin District, Jinan City.

[0110] Experimental conditions: Before the experiment, rice bushes were beaten to shake the planthoppers and evenly distribute them. All plots were cultivated under uniform conditions, consistent with local agricultural practices (GAP).

[0111] The experimental plots were arranged in random blocks, with a plot area of ​​30m 2 Each treatment was repeated 4 times, and ridges were built between the experimental plots to prevent mutual interference between the plots.

[0112] Test method: The test was carried out at the early stage of rice planthopper occurrence. A backpack sprayer was used to spray the entire rice plant, and the pesticide was applied once in total.

[0113] Survey method: In each plot, 10 points were surveyed using the parallel jumping method, with 2 rice clumps at each point. The rice clumps were shaken or patted, and the number of planthoppers floating on the water surface between the rice clumps was counted. The base number of insect population was surveyed before treatment, and the number of residual insects was surveyed 3 days and 7 days after treatment. The insect population reduction rate and control effect were calculated.

[0114] During the experiment, the rice in each treatment group grew well, and no pesticide damage occurred in any treatment group.

[0115] Field efficacy calculation method:

[0116]

[0117]

[0118] The results of the field efficacy test are shown in Table 4.

[0119] Table 4 Field efficacy of the emulsifiable concentrate of bifenthrin and nitenpyram against rice planthoppers

[0120]

[0121] As shown in the field efficacy test results in Table 4, the compounded emulsifiable concentrate formulations of the present invention exhibited excellent control effects against rice planthoppers. The compounded emulsifiable concentrates of bifenthrin and nitenpyram of Preparation Examples 1-4 exhibited significantly better control effects against rice planthoppers than Control Examples 7-9, with control efficacies exceeding 86% 15 days after application. The compounded emulsifiable concentrates exhibited the best control effects against rice planthoppers, with a control efficacy of 91.99%, when the mass ratio of bifenthrin to nitenpyram in the formulation was 2:3 and the weight ratio of the combined solvents, dimethyl sulfoxide, propylene carbonate, and trimethylbenzene, was 1:2:2.

[0122] Experiments have shown that the emulsifiable concentrate formulated with bifenthrin and nitenpyram exhibits excellent control efficacy against target pests. The resulting emulsifiable concentrate formulation exhibits significant control efficacy, a rational component system, and, through the use of a composite solvent and a reasonable proportioning, excellent emulsification, low degradation of the active ingredients, and excellent low-temperature and thermal storage stability. Furthermore, no crop damage was observed in the experiments.

Claims

1. An emulsifiable concentrate containing bifenthrin and nitenpyram, characterized in that: The emulsifiable concentrate is composed of the following components in percentage by weight: 1-50% bifenthrin, 1-30% nitenpyram, 1-30% emulsifier, 1-30% wetting and penetrating agent, and the balance is a composite solvent; The composite solvent consists of a sulfur-containing solvent, an ester and ether ester solvent, and an aromatic hydrocarbon solvent; The sulfur-containing solvent is dimethyl sulfoxide; The ester and ether ester solvents include one or more of propylene carbonate, ethylene carbonate, diethyl carbonate, dimethyl carbonate, methyl ethyl carbonate, propylene glycol methyl ether acetate, ethylene glycol tert-butyl ether or propylene glycol methyl ether; The aromatic hydrocarbon solvent includes one or more of xylene, trimethylbenzene or tetramethylbenzene; The weight ratio of the sulfur-containing solvent, the ester and ether ester solvent, and the aromatic hydrocarbon solvent in the composite solvent is (1-2): (1-5): (1-8).

2. The emulsifiable concentrate according to claim 1, wherein The emulsifiable concentrate is composed of the following components in percentage by weight: 5-40% of bifenthrin, 5-30% of nitenpyram, 1-15% of emulsifier, 5-15% of wetting and penetrating agent, and the balance is a composite solvent.

3. emulsifiable concentrate according to claim 2, characterized in that, The percentage of the bifenthrin is 10%, and the percentage of the nitenpyram is 15%.

4. The emulsifiable concentrate according to claim 1, wherein The weight ratio of the sulfur-containing solvent, the ester and ether ester solvent, and the aromatic hydrocarbon solvent in the composite solvent is (1-2): (1-4): (1-6).

5. The emulsifiable concentrate according to claim 4, wherein The weight ratio of the sulfur-containing solvent, the ester and ether ester solvents, and the aromatic hydrocarbon solvent in the composite solvent is 1:2:

2.

6. The emulsifiable concentrate according to claim 1, wherein The emulsifier is selected from one or more of polyarylphenol polyoxyethylene ether, ethylene oxide-propylene oxide block polyether, and calcium dodecylbenzenesulfonate.

7. The emulsifiable concentrate according to claim 1, wherein The wetting and penetrating agent is selected from one or more of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, alkanolamide polyoxyethylene ether, alkyl polyoxyethylene ether succinate sulfonate, and isomeric tridecanol polyoxyethylene ether.

8. according to the application of each described emulsifiable concentrate of claim 1-7 in preventing and treating agricultural, forestry and gardening pests.

9. The use according to claim 8, characterized in that The pests are Hemiptera, Thysanoptera, and Lepidoptera pests; The Hemiptera pests are tea green leafhoppers, rice planthoppers, aphids, and whiteflies; the Thysanoptera pests are thrips; and the Lepidoptera pests are peach borer and cotton bollworm.

10. The method for preparing the emulsifiable concentrate containing bifenthrin and nitenpyram according to any one of claims 1 to 7, characterized in that: Add the measured amount of bifenthrin, nitenpyram, wetting and penetrating agent and composite solvent into a mixing kettle to dissolve them, then add the emulsifier, make up with the composite solvent, stir evenly and filter to obtain the product.

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