CN119385173A - Pyrethroid-containing insecticidal composition and insecticide - Google Patents

Abstract

The invention belongs to the technical field of agricultural pests, and particularly relates to a pyrethroid-containing insecticidal composition and an insecticide. The pyrethroid-containing insecticidal composition is prepared by compounding pyrethroid and a second active ingredient, wherein the pyrethroid is silafluofen, and the second active ingredient is selected from any one of sulfenamide, matrine and epoxy insect. The invention compounds the pyrethroid agent, namely the silafluofen, the sulfenamide, the matrine or the imidacloprid, wherein the silafluofen and the sulfenamide have synergistic effect on agricultural pests in the mass ratio range of 1-16:24-1, the silafluofen and the matrine in the mass ratio range of 1-30:8-1 and the silafluofen and the imidacloprid in the mass ratio range of 1-10:10-1, the drug resistance of the pests is overcome and delayed, the effect is superior to that of single-agent prevention and control, and the prevention and control cost is reduced.

Description

Pyrethroid-containing insecticidal composition and insecticide

Technical Field

The invention belongs to the technical field of agricultural pests, and particularly relates to a pyrethroid-containing insecticidal composition and an insecticide.

Background

Silafluofen (silafiuofen) is a broad-spectrum insecticidal acaricide developed by the company of Anvant, japan, and has a molecular formula of C25H29FO2Si, a molecular weight of 408.59, and a structural formula:

The pure silafluofen is light yellow liquid, is slightly soluble in water, is mutually soluble in an organic solvent, and is not easy to decompose under alkaline conditions. The silafluofen is a sodium ion channel regulator, acts on the nervous system of insects, can keep the sodium ion channel unblocked, and the sodium ion channel participates in the action potential conduction along the nerve axon to cause the insect to be over excited. In some cases, nerve conduction block is also caused. The silafluofen is mainly used for preventing and controlling pests in paddy fields, can also be used for preventing and controlling pests and mites on other crops, and has good repellent effect on termites.

In the crop production process, pesticides are widely used in a large quantity and frequently, so that pests are easy to generate drug resistance to the pesticides, and the occurrence of resistant pests is more and more serious, so that the agricultural production is influenced. Although pyrethroid medicaments such as silafluofen have good control effects on various pests such as aphids, the pests have obvious drug resistance with long-term use. Therefore, searching for the insecticidal composition or insecticide which has good control effect on resistant pests and can delay the generation of the drug resistance of the resistant pests has great significance for the green and healthy development of agriculture.

Disclosure of Invention

The invention aims to provide a pyrethroid-containing insecticidal composition and an insecticide, which are used for solving the problem that pyrethroid medicines such as silafluofen have good control effects on various pests such as aphids, but have obvious drug resistance on the pests along with long-term use of the pyrethroid-containing insecticidal composition.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the pyrethroid-containing insecticidal composition is prepared by compounding pyrethroid and a second active ingredient, wherein the pyrethroid is silafluofen, and the second active ingredient is selected from any one of sulfenamide, matrine and epoxy insect.

Preferably, the mass ratio of the silafluofen to the sulfenapyr is 1-16:24-1.

Preferably, the mass ratio of the silafluofen to the matrine is 1-30:8-1.

Preferably, the mass ratio of the silafluofen to the epoxy insect is 1-10:10-1.

The invention also provides an insecticide which consists of an effective component and an auxiliary component, wherein the effective component is the pyrethroid-containing insecticidal composition, and the auxiliary component is an auxiliary component which is allowed to be added in the pharmacy. In the preparation of pesticides, the skilled person can choose the appropriate auxiliary ingredients according to the dosage form to be processed.

Preferably, the mass of the active ingredient accounts for 1-55% of the total mass of the pesticide.

Compared with the prior art, the invention has the following beneficial effects:

The pyrethroid agent, the silafluofen, the sulfenamide, the matrine or the imidacloprid are compounded, the silafluofen and the sulfenamide are in the mass ratio range of 1-16:24-1, the silafluofen and the matrine are in the mass ratio range of 1-30:8-1, and the silafluofen and the imidacloprid are in the mass ratio range of 1-10:10-1, so that synergistic effects are generated on agricultural pests such as aphids, the pest resistance is overcome and delayed, the effect is superior to the single-agent prevention effect, and the prevention and control cost is reduced.

Detailed Description

All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.

1. Test agent

93% Of silafluofen (Jiangsu-you-Jia plant protection Co., ltd.), 95% of sulfenamide (Zhejiang Yuan Biotechnology Co., ltd.), 98% of matrine (Shanghai Yuan Ye Biotechnology Co., ltd.), 95% of epoxy-vermin (Sichuan and bang Biotechnology Co., ltd.)

2. Test pest

And (3) continuously breeding the wheat long tube aphids collected in the paddy field for 6 generations, and selecting healthy wing-free adult aphids with consistent insect bodies as test pests.

3. Test method (refer to "NY/T1154.6-2006 pesticide laboratory biological assay test guidelines pesticide part 6: insecticidal Activity test method of soaking insects

The test agent is dissolved by dimethyl sulfoxide and then diluted by 0.1% Tween-80 aqueous solution to prepare a single-dose mother solution, and the concentration of the active ingredient in the single-dose mother solution is 8000mg/L. And (3) setting a plurality of groups of proportion combinations, and diluting the single-dose mother solution and the proportion mixture into 5 mass concentration gradients by using 0.1% Tween-80 aqueous solution. 50mL of each liquid medicine with mass concentration is prepared for the preparation at present. And then the tested pests are completely immersed in the pesticide liquid for 10 seconds, and then are taken out, and the excessive pesticide liquid is sucked and is transferred to the original condition for continuous feeding. The liquid medicine with each mass concentration is repeated for 4 times, and 25 heads of insects are immersed in each time, and meanwhile, the treatment of the liquid medicine containing only 0.1% of Tween-80 is set as a blank control. And (5) after the insect immersing treatment is carried out for 36 hours, the death condition of the tested insect is investigated, and the corrected death rate of different liquid medicine treatments at the positions is calculated.

In the formula, the unit of P-mortality is the number of dead insects, K-mortality is the number of total insects, and N-total insects are treated.

In the above, P ₁ - -the corrected mortality, P _t - -the treated mortality, P ₀ - -the blank mortality, in%.

4. Data analysis

Regression analysis is carried out on the medicine liquid concentration logarithmic value and the corrected mortality probability value, LC ₅₀ of single dose and mixed medicine is calculated, the co-toxicity coefficient (CTC value) of the mixed medicine is calculated by adopting the grand cloud Peel method, and the synergy of the mixed medicine is evaluated according to the co-toxicity coefficient value, and the results are shown in tables 1-3.

TABLE 1 Combined toxicity results of silafluofen and sulfenamide on wheat head aphids

The combined toxicity activity test shows that the silafluofen and the sulfenamide compound have good indoor activity on the wheat long tube aphid, and when the compound mass ratio is within 1-16:24-1, the co-toxicity coefficient on the wheat long tube aphid is more than 120, and the synergistic effect is achieved.

TABLE 2 Combined virulence results of Fluorosilathrin and matrine combination on Metarhizium Mai

The combined toxicity activity test shows that the silafluofen and matrine compound has good indoor activity on the wheat long tube aphid, and the co-toxicity coefficient on the wheat long tube aphid is greater than 120 when the compound mass ratio is within 1-30:8-1, so that the synergistic effect is achieved.

TABLE 3 Combined toxicity results of silafluofen and imidacloprid on wheat long tube aphids

The combined toxicity activity test shows that the silafluofen and the epoxy insect-cloprid compound has good indoor activity on the wheat long tube aphid, and when the compound mass ratio is 1-10:10-1, the co-toxicity coefficient on the wheat long tube aphid is more than 120, and the synergistic effect is achieved.

In summary, the pyrethroid agent, namely the silafluofen and the sulfenamide, the matrine or the epoxy insect-line are compounded, the silafluofen and the sulfenamide are in the mass ratio range of 1-16:24-1, the silafluofen and the matrine are in the mass ratio range of 1-30:8-1, and the silafluofen and the epoxy insect-line are in the mass ratio range of 1-10:10-1, so that synergistic effects are generated on agricultural pests such as aphids, the pest resistance is overcome and delayed, the effect is superior to the single-agent control effect, and the control cost is reduced.

Claims (6)

1. The pyrethroid-containing insecticidal composition is characterized by being prepared by compounding pyrethroid and a second active ingredient, wherein the pyrethroid is silafluofen, and the second active ingredient is selected from any one of sulfenamide, matrine and epoxy insect.

2. A pyrethroid-containing insecticidal composition according to claim 1, wherein the mass ratio of silafluofen to sulfenapyr is 1-16:24-1.

3. A pyrethroid-containing insecticidal composition according to claim 1, wherein the mass ratio of silafluofen to matrine is 1-30:8-1.

4. A pyrethroid-containing insecticidal composition according to claim 1, wherein the mass ratio of silafluofen to imidacloprid is 1-10:10-1.

5. A pesticide is characterized by comprising an effective component and an auxiliary component, wherein the effective component is the pyrethroid-containing insecticidal composition as claimed in claims 1-4, and the auxiliary component is an auxiliary component which is allowed to be added in the aspect of agriculture pharmacy.

6. The insecticide according to claim 5, wherein the mass of the active ingredient is 1 to 55% of the total mass of the insecticide.