An insecticidal composition for controlling cowpea thrips

Abstract

The present invention relates to the technical field of pesticides, and specifically relates to an insecticidal composition for controlling cowpea thrips. Its active ingredients are composed of a binary compound of Indazapyroxamet and ethyl methoxypiperidinecarboxylate, and the mass ratio of Indazapyroxamet to ethyl methoxypiperidinecarboxylate is 1:8 to 1:1. When the two active ingredients in the insecticidal composition of the present invention are compounded in a certain mass ratio, a synergistic effect is shown, and the generation of pest resistance can be effectively delayed.

Description

Technical Field

[0001] The present invention relates to the technical field of pesticides, and particularly relates to an insecticidal composition for controlling cowpea thrips. Background Art

[0002] Cowpea is one of the common vegetable categories in people's lives and is widely cultivated in China. During the planting process, it will be damaged by diseases such as brown spot, anthracnose, and bacterial blight, and pests such as legume pod borer, slug, spider mite, and thrips. Among them, thrips are the most difficult to control. Cowpea thrips can damage cowpea throughout its growth period. Under suitable environmental conditions, it only takes more than 20 days to reproduce one generation, and the generation overlap is quite serious. Thrips mainly damage young tissues such as young leaves, apical buds, and lateral buds, as well as flower buds and pods. Thrips are afraid of light and have the habit of coming out at night and hiding during the day. As the light intensity increases, the thrips damaging on the leaves will hide in the flowers to move, which is also the reason why thrips are difficult to control.

[0003] At present, the control of cowpea thrips mainly relies on spraying chemical agents. Chemical agents have the advantages of quick effect and good control effect, but at the same time, chemical agents also have the disadvantages of drug resistance, pesticide residues, and environmental pollution. Especially when a single chemical agent is applied for a long time, the negative effects of chemical agents are more prominent. After compounding the active ingredients of pesticides with different action mechanisms, three action types will be shown: addition, synergism, and antagonism. Among them, the compounding showing the synergistic type can effectively delay the generation of drug resistance and improve the control effect on target pests and diseases compared with single agents.

[0004] Indazapyroxamet is a pyridine-containing amide insecticide developed by FMC Corporation and is used for the control of western flower thrips, potato leafhoppers, cotton aphids, green peach aphids, and sweet potato whiteflies.

[0005] Ethiprole is a spirotetramat insecticide developed by Syngenta. Its mechanism of action is a lipid biosynthesis inhibitor. By inhibiting the activity of ACCase in the process of fat synthesis in pests, it disrupts lipid synthesis, thereby blocking the normal energy metabolism of pests and ultimately causing the death of pests. It can be used for crops such as apples, pears, grapes, citrus fruits, tomatoes, legumes, cotton, and potatoes to control pests or mites including aphids, whiteflies, psyllids, armored scales, soft scales, spider mites, rust mites, red spiders, green peach aphids, tobacco whiteflies, and cotton aphids.

[0006] The present invention discovers through a large number of experiments that when Indazapyroxamet and Ethiprole are binary compounded in a certain mass ratio, an obvious synergistic effect is shown. There is no report on this aspect yet. Summary of the Invention

[0007] The object of the present invention is to provide an insecticidal composition for efficiently, safely and environmentally friendly controlling cowpea thrips, so as to solve the problems existing in the long-term single application of chemical agents.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] An insecticidal composition for controlling cowpea thrips, the active ingredients of which are composed of a binary compound of Indazapyroxamet and ethyl methoxypiperidine carboxylate.

[0010] The mass ratio of Indazapyroxamet to ethyl methoxypiperidine carboxylate is 1:8 to 1:1.

[0011] Preferably, the mass ratio of Indazapyroxamet to ethyl methoxypiperidine carboxylate is 1:2.

[0012] The insecticidal composition of the present invention can be made into various dosage forms such as suspension agent, wettable powder, dispersible oil suspension agent, water dispersible granule, etc.

[0013] Preferably, the insecticidal composition of the present invention can be made into a dispersible oil suspension agent.

[0014] The mass percentage of each component in the dispersible oil suspension agent: Indazapyroxamet 5-15%, ethyl methoxypiperidine carboxylate 10-25%, essential oil 0.1-5%, dispersant 3%-

[0015] 15%, emulsifier 5%-25%, stabilizer 1%-5%, thickener 1%-5%, and the dispersing medium is made up to 100%.

[0016] The essential oil is a compound essential oil, and the mass ratio of the components contained in the compound essential oil is: rosewood essential oil: clove oil = 3:1 to 2:1.

[0017] The dispersant is selected from one or a combination of polycarboxylates, lignosulfonates, alkylphenol polyoxyethylene ether methyl ether condensate sulfates, calcium alkyl sulfonates, sodium naphthalene sulfonate formaldehyde condensates, alkylphenol polyoxyethylene ethers, fatty acid polyoxyethylene esters, fatty amine polyoxyethylene ethers, glycerol fatty acid ester polyoxyethylene ethers.

[0018] The emulsifier is selected from one or a combination of calcium dodecylbenzene sulfonate, fatty acid polyoxyethylene ether, alkylphenol polyoxyethylene ether sulfosuccinate, styrylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, castor oil polyoxyethylene ether, fatty acid polyoxyethylene ester, polyoxyethylene fatty alcohol ether.

[0019] The stabilizer(s) selected is / are one or a combination of several of tert-butyl-p-hydroxyanisole, 3-tert-butyl-4-hydroxyanisole, dibutylhydroxytoluene, propyl 3,4,5-trihydroxybenzoate, and octyl 3,4,5-trihydroxybenzoate.

[0020] The thickener(s) selected is / are one or a combination of several of xanthan gum, carboxymethyl cellulose, carboxyethyl cellulose, methyl cellulose, magnesium aluminum silicate, and polyvinyl alcohol.

[0021] The dispersion medium(s) selected is / are vegetable oil, mineral oil, and methyl oleate.

[0022] The preparation method of the dispersible oil suspension is as follows: First, add the emulsifier, dispersant, and dispersion medium to the reaction kettle, mix and disperse evenly; add the thickener, stabilizer, essential oil, Indazapyroxamet, and ethyl methoxypiperidine under high-speed shearing, and perform sand grinding under the grinding medium until the particle size is below 5 μm to obtain the dispersible oil suspension containing Indazapyroxamet and ethyl methoxypiperidine.

[0023] The insecticidal composition provided by the present invention is applied to control agricultural pests, preferably to control cowpea thrips, etc.

[0024] Beneficial technical effects:

[0025] 1. The compound composition with Indazapyroxamet and ethyl methoxypiperidine as the active ingredients in the present invention shows obvious synergistic effects, improves the control effect on cowpea thrips, can reduce the dosage of the medicament, reduce the control cost, and at the same time can reduce pesticide residues and relieve the environmental pressure.

[0026] 2. The dispersible oil suspension provided by the present invention, with the addition of a compound essential oil, has a good attracting effect on thrips, making the thrips hidden in the flowers run outside the flowers to move, and improving the control effect of the medicament on cowpea thrips.

[0027] 3. The dispersible oil suspension provided by the present invention increases the adhesiveness, spreading property, and permeability of the active ingredients on the surface of crops and targets, thereby improving the control effect on cowpea thrips.

[0028] 4. The composition of the present invention is compounded from two active ingredients with different action mechanisms, and can delay the generation of resistance of cowpea thrips. Specific embodiments

[0029] The following describes the specific embodiments of the present invention in detail, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0030] Formulation examples:

[0031] 27% Indazapyroxamet·Ethyl Methopiperidinecarboxylate Dispersible Oil Suspension

[0032] It contains components with the following mass percentages: 9% Indazapyroxamet, 18% Ethyl Methopiperidinecarboxylate, 10% lignosulfonate (dispersant), 16% polyoxyethylene fatty alcohol ether (emulsifier), 0.75% rosewood, 0.25% clove oil, 2% 3-tert-butyl-4-hydroxyanisole (stabilizer), 2% xanthan gum (thickener), and methyl oleate is added to make up to 100%.

[0033] The preparation method is as follows: First, add 160 g of polyoxyethylene fatty alcohol ether (emulsifier), 100 g of lignosulfonate (dispersant), and 414.4 g of methyl oleate (dispersing medium) to the reaction kettle, mix and disperse evenly; under high-speed shearing, add 20 g of 3-tert-butyl-4-hydroxyanisole (stabilizer), 20 g of xanthan gum (thickener), 7.5 g of rosewood, 2.5 g of clove oil, 91.9 g of 98% Indazapyroxamet technical and 183.7 g of 98% Ethyl Methopiperidinecarboxylate technical, and perform sand grinding under the grinding medium until the particle size is below 5 μm to obtain 27% Indazapyroxamet·Ethyl Methopiperidinecarboxylate dispersible oil suspension.

[0034] Indoor Bioassay Example

[0035] Test object: Cowpea thrips.

[0036] Test method: The leaf dipping method is adopted. Dissolve the technical in ethanol to prepare a single-agent stock solution, set multiple ratios, and set multiple gradient mass concentrations for each single agent and the mixed agents of each ratio according to the geometric ratio method. Dip the clean and insect-free cowpea tender leaves in the liquid medicine for 8 s, take them out and place them in a petri dish with a moisturizing filter paper, with the back facing up and air-dry naturally for use. Each treatment is repeated 3 times, and a treatment containing only ethanol is set as the blank control. Use a soft brush to introduce adult thrips onto the back of the leaves of each treatment, seal the petri dish with plastic wrap, and punch holes in the plastic wrap with a No. 0 insect pin. 20 insects are introduced for each repetition. Place the petri dishes containing thrips in an artificial climate chamber at a temperature of (25±2)°C, a humidity of (60±2)%, and a daily light of 14 h. Observe the survival of the test insects 24 h after treatment. Gently touch the insect body with a soft brush, and if it does not move, it is judged as dead, and calculate the mortality of each treatment. Perform regression analysis based on the logarithm of the concentration of each pesticide and the corresponding mortality probability value, and calculate the LC 50 . Evaluate the interaction of the mixed agents according to the Wadley method, where SR = 0.5 - 1.5, 0 indicates that the two pesticides have an additive effect when compounded; SR ≤ 0.5 indicates an antagonistic effect; SR ≥ 1.5 indicates a synergistic effect.

[0037] LC 50(Theoretical value) = (a + b) / (a / LC 50 a + b / LC 50 b)

[0038] SR = LC 50 (Theoretical value) / LC 50 (Actual value)

[0039] The test results are shown in Table 1.

[0040] Table 1 Results of the joint toxicity determination of indazapyroxamet and methoprene on cowpea thrips in the laboratory

[0041]

[0042]

[0043] As can be seen from Table 1, after indazapyroxamet and methoprene are compounded in a certain ratio, they show two different joint actions on cowpea thrips: additive and synergistic. When the mass ratio of indazapyroxamet to methoprene is 1:8 to 1:1, the compound composition shows a synergistic effect on cowpea thrips. In particular, when the mass ratio of indazapyroxamet to methoprene is 1:2, the SR value is 3.86, and the synergistic effect is significant.

[0044] In summary, indazapyroxamet and methoprene of the present invention are compounded in a certain mass ratio and have a synergistic effect. Compared with single agents, the insecticidal composition of the present invention has the advantages of a unique action mechanism, good control effect, low dosage, and environmental protection. Therefore, the research and development and promotion of the insecticidal composition of the present invention have great economic and social significance.

Claims

1. An insecticidal composition for controlling cowpea thrips, characterized in that, Its active ingredient is composed of a binary compound of Indazapyroxamet and ethyl methoxypiperidinecarboxylate, and the mass ratio of Indazapyroxamet to ethyl methoxypiperidinecarboxylate is 1:8 to 1:

1.

2. The pesticidal composition according to claim 1, wherein The mass ratio of Indazapyroxamet to ethyl methoxypiperidinecarboxylate is 1:

2.

3. The pesticidal composition according to claim 1 or 2, wherein The dosage form is suspension concentrate, wettable powder, dispersible oil suspension, water dispersible granule.

4. The pesticidal composition according to claim 3, characterized in that, The dosage form is dispersible oil suspension.

5. A dispersible oil suspension containing the insecticidal composition for controlling cowpea thrips as described in claim 1, characterized in that, The mass percentages of each component of the said dispersible oil suspension: Indazapyroxamet 5 - 15%, ethyl methoxypiperidinecarboxylate 10 - 25%, essential oil 0.1 - 5%, dispersant 3% - 15%, emulsifier 5% - 25%, stabilizer 1% - 5%, thickener 1% - 5%, and the dispersing medium is made up to 100%.

6. The oil-dispersible suspension concentrate according to claim 5, wherein The said essential oil is a compound essential oil, and the mass ratio of the components included in the compound essential oil is: rosewood essential oil : clove oil = 3:1 to 2:

1.

7. The oil-dispersible suspension concentrate according to claim 5, wherein The said dispersant is selected from one or a combination of polycarboxylate, lignosulfonate, alkylphenol polyoxyethylene ether methyl ether condensate sulfate, calcium alkyl sulfonate, sodium naphthalene sulfonate formaldehyde condensate, alkylphenol polyoxyethylene ether, fatty acid polyoxyethylene ester, fatty amine polyoxyethylene ether, glycerol fatty acid ester polyoxyethylene ether.

8. The dispersible oil suspension according to claim 5, wherein The said emulsifier is selected from one or a combination of calcium dodecylbenzenesulfonate, fatty acid polyoxyethylene ether, alkylphenol polyoxyethylene ether sulfosuccinate, styrylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, castor oil polyoxyethylene ether, fatty acid polyoxyethylene ester, polyoxyethylene fatty alcohol ether.

9. The dispersible oil suspension according to claim 5, wherein The said stabilizer is selected from one or a combination of tert-butylhydroxyanisole, 3-tert-butyl-4-hydroxyanisole, dibutylhydroxytoluene, propyl 3,4,5-trihydroxybenzoate, and octyl 3,4,5-trihydroxybenzoate.

10. The oil-dispersible suspension concentrate according to claim 5, wherein The said thickener is selected from one or a combination of xanthan gum, carboxymethyl cellulose, carboxyethyl cellulose, methyl cellulose, magnesium aluminum silicate, polyvinyl alcohol.

11. The dispersible oil suspension according to claim 5, characterized in that, The said dispersing medium is selected from vegetable oil, mineral oil, methyl oleate.

12. The oil-dispersible suspension concentrate according to claim 5, wherein, The preparation method is: first add the emulsifier, dispersant, and dispersing medium into the reaction kettle, mix and disperse evenly; add the thickener, stabilizer, essential oil, Indazapyroxamet, and ethyl methoxypiperidinecarboxylate under high-speed shearing, and perform sand grinding under the grinding medium until the particle size is below 5 μm to obtain the dispersible oil suspension containing Indazapyroxamet and ethyl methoxypiperidinecarboxylate.

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