Sustained-release granule for killing nematodes and preventing root diseases and preparation method of same

Abstract

The invention discloses a sustained-release granule for killing nematodes and preventing root diseases and a preparation method of same. The sustained-release granule includes an active component andan auxiliary component, wherein the active component contains dinotefuran and hymexazol, and the auxiliary component contains a binder, a dispersant, a wetting agent, a sustained release agent, fillerand a coating. The preparation method mainly includes the following steps: performing adsorption to the hymexazol with the filler supporter to obtain a master powder; uniformly mixing the master powder, a dinotefuran original medicine, the wetting agent, the dispersant, the sustained release agent and the filler, crushing the mixture through a jet mill; adding the binder to the crushed mixture and performing squeezing granulation through a squeezing granulator; and coating the granules with the coating material to prepare the sustained-release granule which has stable quality. The sustained-release granule has significant prevention and treatment effect, is easy to apply and is effective, is flexible to use, has long lasting time, is free of phytotoxicity, is harmless to soil and crops, and is safe to producers and users.

Description

technical field [0001] The invention relates to the technical field of pesticide compounding, in particular to a slow-release granule for killing nematodes and preventing root diseases and a preparation method thereof. Background technique [0002] Due to continuous cropping and long-term irrational use of chemical fertilizers and pesticides, soil problems such as soil compaction and acidification are serious, causing nematodes and root soil-borne diseases to occur and become more serious year after year. The two main types of nematodes are root-knot nematodes and cyst nematodes. Nematodes generally reduce production by 10% to 40%, and some crops can reduce production by more than 80% or even fail when they are planted repeatedly. [0003] Root diseases are mainly fungi, which infect the roots or necks of crops when the conditions are suitable. They are divided into obligate parasitism and non-obligate parasitism. Obligate parasitism is the pathogenic fungus of plant vascula...

AI Technical Summary

Problems solved by technology

However, due to limited land resources, disease-resistant and disease-resistant varieties can only reduce the harm of nematodes and root diseases, and the development of varieties is difficult and costly; some pathogens can survive in the soil for 5-10 years, and it is difficult to achieve crop rotation; highly toxic soil treatment agents Large residues, high cost, killing both beneficial and harmful bacteria, destroying the ecological environment of the soil rhizosphere, and some have carcinogenic and teratogenic effects; high-temperature stuffy sheds are only suitable for facility cultivation, time-consuming operations, and killing both beneficial and harmful bacteria, Destruction of soil ecological balance; foliar spraying is slow to take effect, the cure is not complete, and the symptoms are found in the later stage, the treatment is difficult, the preventive effect is not outstanding, the roots are labor-intensive and time-consuming, and the operation is inconvenient

In addition, a large amount of watering liquid pesticides is likely to cause soil pollution, the waste of pesticides and input costs are relatively high, and the active ingredients that penetrate into the root depth are usually difficult to meet the lethal concentration requirements, so the control effect is not ideal

The current solutions are not only difficult to grasp the timing of prevention and control, but also difficult to eradicate. There is also a common problem of using large doses of pesticides, causing serious problems in the environment and toxic substances in plants.

In addition, most of the medicaments for the prevention and treatment of nematodes and root diseases are based on single products, which only treat nematodes or only control root diseases. The effect is single and the control effect is poor.

[0006] Granules are a common dosage form of solid pesticides. They can be applied by spreading, hole application, seed fertilizer simultaneous sowing, furrow application, and flushing application. They are more suitable for root diseases of crops, directly reach the lesion, and are efficient and fast. They can also be used flexibly according to the disease and different crops. method, saving labor and time, but the effective time in the soil is short, easy to volatilize and lose its effect, especially when the rain is too heavy, the granules are quickly dissolved and released, which is easy to cause phytotoxicity