CN110999910A

CN110999910A - Insecticidal composition for preventing and controlling crop pests

Info

Publication number: CN110999910A
Application number: CN201911353904.1A
Authority: CN
Inventors: 朱怀铜; 汪云强; 张彬; 梅洪玲; 吴文静; 黄永灿; 夏葵
Original assignee: Anhui Huilong Group Yinshan Pharmaceutical Co ltd
Current assignee: Anhui Huilong Group Yinshan Pharmaceutical Co ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-04-14

Abstract

The invention provides an insecticidal composition for preventing and treating crop pests, wherein the weight ratio of bromofenobendiamide to pymetrozine is 1:30-30: 1. The composition has obvious synergistic effect, can reduce the using amount of medicaments, reduce the cost, reduce the harm to the environment and is beneficial to delaying the generation of the drug resistance of pests, namely the rice planthoppers.

Description

Insecticidal composition for preventing and controlling crop pests

Technical Field

The invention belongs to the field of agricultural chemistry, and particularly relates to an insecticidal composition for preventing and treating crop pests.

Background

The rice planthopper belongs to the family homoptera planthopper, main populations of brown planthopper (Nilaparvata lugens), sogatella furcifera and Laodelphax striatellus are one of the main pests on rice in China. In recent years, under the influence of various factors such as warm temperature and improper pesticide application behaviors in winter and spring, rice planthoppers are increasingly seriously damaged on rice, wherein the population quantity of the rice planthoppers is on the trend of increasing year by year, and brown planthoppers are continuously generated for several years, so that the rice safety production is seriously threatened. The frequent use and the continuous increase of the dosage of imidacloprid, buprofezin and other medicaments with good control effect on rice planthoppers in the past greatly improve the drug resistance of the rice planthoppers and bring great difficulty to the effective control of the rice planthoppers.

The brofenpyrad fluorobenzene bisamide is a novel bisamide insecticide jointly developed by Mitsui agricultural chemical company and Pasteur in Japan, and is mainly used for controlling lepidoptera and coleoptera pests of leafy vegetables, cereals and other perennial crops, and sanitary pests such as termites, mosquitoes, flies and the like. The pymetrozine has the action mechanism that after adult insects and nymphs contact, the effect of blocking the oral cavity needles is generated, feeding is stopped to be harmful, starvation is dead, and the pymetrozine has no cross resistance with the existing numerous insecticides, can control most homoptera pests, particularly pests of aphididae, aleyrodidae, leafhopper families and delphacidae families, and is suitable for vegetables, rice, cotton, fruit trees and various field crops. However, in the practical application process, the single dose of the pymetrozine used alone has poor quick-acting performance, and pests are easy to generate resistance

In the prior art, no report is provided about the compounding of the flubendiamide and the pymetrozine.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides the following technical scheme:

the insecticidal composition for preventing and treating crop pests is characterized in that active ingredients comprise flubendiamide and pymetrozine, and the weight ratio of the flubendiamide to the pymetrozine is 1:30-30: 1.

The insecticidal composition is characterized in that the weight ratio of the brotrochan fluorobenzene diamide to the pymetrozine is 1:30-1:15 and 30: 1.

The insecticidal composition is characterized by further comprising agriculturally acceptable auxiliaries, wherein the weight percentage of the active ingredients is 5-70%.

The insecticidal composition is characterized in that the auxiliary agent comprises a dispersing agent, an emulsifying agent, a disintegrating agent, a stabilizing agent, a wetting agent, a synergist, a penetrating agent, a defoaming agent, a thickening agent, a preservative, a solvent or a filler and the like.

The insecticidal composition is characterized in that: the dosage form which can be prepared by the composition is wettable powder, water dispersible granules and suspending agent.

The invention also relates to the use of the insecticidal composition according to the invention for controlling crop pests. Preferably the control of rice planthoppers.

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

the composition has excellent control effect on rice planthopper, has obvious synergistic effect after mixing, improves the control effect, and is beneficial to overcoming and delaying the generation of drug resistance of pests.

The composition of the invention is mixed with pesticide to reduce the dosage, thereby reducing the cost and lightening the pollution to the environment, having good safety and meeting the safety requirement of pesticide preparations.

Detailed Description

The following detailed description of specific embodiments of the present invention is provided in conjunction with examples, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Example 1

20% bromofenoxanil-pymetrozine suspension

Example 2

40% wettable powder of bromofenoxanil-pymetrozine suspension

Example 3

50% bromofenoxaprop-benzene bisamide-pymetrozine suspending agent water dispersible granule

Example 4

Indoor bioassay: indoor insecticidal toxicity determination method of brofenthiuron fluorobenzene bisamide and pymetrozine on brown planthopper

The test object is brown planthopper, and is artificially fed for many generations indoors without contacting any medicament; selecting nymphs of 3 years.

The test method comprises the following steps: adopts a rice stem soaking method. Selecting rice seedlings which are cultured in a laboratory and have the same and robust tillering stage, digging with roots, cleaning, cutting into rice stems with roots of 10cm long, and airing in a shade until no water mark exists on the surface for later use. After the medicament is prepared into mother solution by dimethyl sulfoxide, 0.1% Tween 80 aqueous solution is respectively diluted into 6 series of concentrations, and the dimethyl sulfoxide and the Tween 80 aqueous solution are used as blank controls. Soaking the prepared rice stem in the medicinal liquid with various concentrations for 30s, taking out, air drying indoors under natural conditions, wrapping the root with wet absorbent cotton, moisturizing, wrapping with preservative film, and placing in test tubes with 3 plants per test tube. Transferring the test insects into test tubes by using an insect sucking device, wherein 15 ends of each test tube are covered by gauze at the tube openings; the treated test insects are raised and observed under the conditions that the temperature is 25 +/-1 ℃, the relative humidity is 60-80%, and the illumination period L: D ═ 16:8) h. The experiment was repeated 4 times. After 48h, the death condition of the test insects is checked, and the corrected mortality is calculated. Control mortality less than 10% is a valid test.

Performing data analysis by adopting a sps software; the co-toxicity coefficient (CTC) of the drug was then calculated according to the Sun cloud Peel method. When the CTC is less than or equal to 80, the composition shows antagonism, when the CTC is more than 80 and less than 120, the composition shows additive action, and when the CTC is more than or equal to 120, the composition shows synergistic action.

TABLE 1 indoor insecticidal toxicity assay of Bromodiophorbide and pymetrozine against Nilaparvata lugens

As shown in Table 1, compared with a single agent, the weight ratio of the flubendiamide to the pymetrozine in the insecticidal composition is in the range of 1:30-30:1, the composition has excellent insecticidal activity on the brown planthopper of the rice, and the composition has a remarkable synergistic effect.

Example 5

And (3) field pesticide effect determination: determination of field control effect of bromofenoxanil and pymetrozine on rice planthopper

Test subjects: rice planthopper

The test method comprises the following steps: referring to the field pesticide effect test criterion (I) for controlling rice planthoppers by using the pesticide; the experiment was set up for dose treatment, blank control, cell area 25m2, randomized block arrangement, and repeated 4 times. Spraying the pesticide at the peak period of incubation of rice planthopper eggs. The investigation method comprises the following steps: population base was investigated before treatment and 7 days after treatment. And (3) surveying 15 points by a parallel jumping method in each cell, 2 clusters in each point, shaking the rice clusters, counting the number of the planthoppers floating on the water surface among the rice clusters, and calculating the reduction rate of insect population and the control effect.

TABLE 2 field control of rice planthoppers by Bromodin fluorobenzene bisamide and pymetrozine

Treatment of	The dosage of the effective components is g/mu	Prevention effect/%)
			Example 1	3.0	91.8
Example 2	3.0	88.6
			Example 3	3.0	86.6
Control	-	-

Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. All percentages in the formulation are by weight. The processing technology of each preparation of the composition is the prior art, and can be changed according to different conditions.

Claims

1. The insecticidal composition for preventing and treating crop pests is characterized in that active ingredients comprise flubendiamide and pymetrozine, and the weight ratio of the flubendiamide to the pymetrozine is 1:30-30: 1.

2. The insecticidal composition according to claim 1, wherein the weight ratio of the brobendiamide to the pymetrozine is 1:30-1:15, 30: 1.

3. An insecticidal composition according to any one of claims 1 to 2 further comprising agriculturally acceptable adjuvants, the active ingredients being present in an amount of from 5 to 70% by weight.

4. The insecticidal composition of claim 3, wherein: the dosage form which can be prepared by the composition is wettable powder, water dispersible granules and suspending agent.

5. Use of the pesticidal composition according to any one of claims 1 to 4 for controlling crop pests.

6. Use according to claim 5, characterized in that for the control of rice planthoppers.