Pymetrozine and abamectin compounded pesticide suspension concentrate and preparation method thereof

Abstract

The invention discloses a pymetrozine and abamectin compounded pesticide suspension concentrate and a preparation method thereof. The pymetrozine and abamectin compounded pesticide suspension concentrate is prepared from, by mass, 1%-20% of pymetrozine, 1%-20% of abamectin, 4%-9% of wetting dispersant, 0.1%-0.3% of a thickening agent, 0.1%-0.5% of a defoaming agent, 4%-7% of an antifreezing agentand the balance deionized water. According to the prepared suspension concentrate, particle size distribution is uniform, and the average particle size ranges from 2 mm to 3 mm; the room temperature,low temperature and heat storage stability of the suspension concentrate is qualified, and the suspension rate reaches 95% or above; the suspension concentrate is compounded with insecticides of different mechanisms of action, synergism is obvious, the insecticidal activity is high, one of the insecticides is a biological insecticide, and the pesticide suspension concentrate is good in environmental compatibility.

Description

technical field [0001] The invention relates to a medicament for preventing and treating rice planthopper, in particular to a compounded suspension of pymetrozine and abamectin and a preparation method thereof. Background technique [0002] Rice planthopper is one of the important pests of rice. It mainly inhibits the growth of rice by directly sucking the liquid nutrients in the phloem of rice plants. The occurrence and harm of rice planthopper are hidden, explosive and destructive. Among them, the brown planthopper is a migratory pest. In addition to directly harming rice, it can also spread rice stripe leaf blight and viral diseases, which seriously hinder the growth of rice. Rice planthopper has become the most important biological disaster affecting rice production in my country, posing a serious threat to food security. [0003] In actual production, although planting insect-resistant rice varieties is an effective and economical method to control rice planthoppers, ...

AI Technical Summary

Problems solved by technology

However, long-term use of a single chemical agent is prone to the following problems: 1) some insecticides are highly toxic to mammals and are very harmful to the ecological environment;

[0004] 2) In order to improve the efficacy, blindly increase the amount of pesticide application and the frequency of pesticide application, which not only increases the cost of control, but also easily causes environmental pollution, and even increases the development of resistance of rice planthoppers, and accelerates the elimination of effective pesticides

[0007] At present, there are many invention patents of disclosed pymetrozine single agent, yet, in the patent of Publication No. Use stabilizer (~20%), penetration agent (~10%), just can reach its described effect; The innovation point mentioned in the patent of publication number CN102283193 A all has embodiment in the present invention; Publication number CN104054701 A The relevant values ​​of the biological activity test do not appear in the patent, which cannot reflect the application performance of the invention

It is worth mentioning that although the physical and chemical properties of a single dose of metrozine have been reported to be qualified, long-term use of a single dose will further increase the development of resistance in rice planthoppers.

[0008] In addition, there are many published patents on the compounding of pymetrozine. The patent application with publication number CN 103875688 A discloses a pesticide composition of pymetrozine and abamectin. There are following deficiencies: there are too many types of active ingredient compositions (pymetrozine, avermectin and chitin), the amount of auxiliary agent used is large, the cost increases, the processing dosage form is granule (or wettable powder WP), and the production During the process, the dust pollution is serious, which endangers the health of the operator

[0009] The patent application with the publication number CN 102349507 A discloses an ultra-low volume liquid containing pymetrozine, which requires the use of a large amount of organic solvents (N-methylpyrrolidone, N,N-dimethylformamide, cottonseed oil) and A large amount of additives (n-amyl alcohol, calcium dodecylbenzenesulfonate, synergist, penetrating agent), especially in embodiment 29 and embodiment 30, the usage of polar organic solvent is relatively large, and the production cost increases, Increased environmental pressure, and all examples require the use of special applicator instruments, which limits their use to some extent

[0010] The application patent of publication number CN 107027800 A discloses a kind of insecticidal composition containing Abamectin B2a, and embodiment 1 (emulsifiable concentrate) and embodiment 3 (microemulsion) use a large amount of organic solvents, cosolvents and emulsification in the preparation agent, and embodiment 4 (water dispersible granules) has many components, and the process is complicated

In Example 8, although the control effect on brown planthopper is better, the amount of preparation used is relatively large (40 g / ha), which does not have an advantage in control cost

[0011] The patent application with the publication number CN 101416634 A discloses an insecticidal composition containing pymetrozine. Although the combination of pymetrozine and abamectin has a certain synergistic effect in the control of rice planthoppers, the highest co-toxicity coefficient Only 164.13

The water-dispersible granules in Example 2 have many components and complicated procedures; the microemulsion in Example 3 uses a large amount of organic solvents and emulsifiers, which easily causes environmental pollution

[0012] The patent application with publication number CN 101669466 A discloses a suspension composition containing pymetrozine, which has not been tested for cold storage (0±2°C) stability, and the particle size of the suspension may increase after being subjected to low temperature , stratification of water and other unstable phenomena

In addition, the biological activity of the combination of pymetrozine and avermectin against rice planthoppers has not been tested, so it cannot be judged that the mixture has a significant synergistic effect on the control of rice planthoppers

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