What measures are there for rational use of pesticides in rainy days?

Many villagers are worried about using pesticides in rainy season, because precipitation will obviously reduce the control effect of pesticides. Here are some countermeasures for using pesticides in rainy season.

Improve the application method: according to the characteristics of drugs, adopt appropriate application methods, such as internal inhalation pesticides, and choose root zone application method to prevent rain erosion and avoid pesticide outflow; According to the regularity of pest occurrence and thematic activities, appropriate pesticide application methods are selected, and pesticides are applied at night, such as pests feeding at night, such as rice leaf roller, so that drugs can quickly penetrate into rice plants and pests can die within 2-3 hours.

Adding adhesive to the liquid medicine: when preparing the liquid medicine, properly adding some adhesive such as soap powder or mulberry liquid can improve the adhesion of pesticides on the epidermis of crops and pests, and it is not easy to wash off the drugs even in moderate rain after application; Add appropriate amount of high-viscosity mineral engine oil or edible oil, soybean powder, cassava starch, etc. Can obviously enhance the adhesion to particles; Water soluble adhesive, such as animal bone glue, shellac, waste honey, etc. Adde into wettable powder or mix solution. After coating, the water evaporates, and the powder is firmly attached to the surface of the coated object, which is resistant to precipitation and washing.

Choose quick-acting pesticides: quick-acting pesticides can kill pests in a short time in rainy days, thus preventing "diffused pesticides" from failing due to precipitation. For example, pirimicarb can kill aphids on crops in a few minutes after application; Phoxim, omethoate, methomyl, Mianlingbao, Guangkewei, mirex and pyrethroid pesticides have strong contact killing effect, and can kill a variety of pests within 1-2 hours after use, with high pest control rate.

Choose systemic pesticides: systemic pesticides can use the roots, stems and leaves of green plants to enter plants and transfer them to other places. For example, after spraying tricyclazole, it rains 1 hour, which basically has no effect on the efficacy; 0 hours after the application of 65438+ phosphoramidite, about 50% of the dose entered the crop mechanism; Omethoate, monocrotophos, dimethoate, thiophanate, triadimefon, triadimefon, triadimefon, etc. And their herbicides acetochlor, fenoxaprop-p-ethyl, glyphosate, etc. The drug has a rapid effect and has been absorbed by green plants for several hours, and its drug is less harmful by precipitation. Amobam, diflubenzuron, pyrethroids, etc. It has strong permeability on the surface of crops, although it has no spreading effect, so it is also suitable for rainy season.

Rain-resistant pesticides, such as agricultural streptomycin, Ludebao, chlorolactone, jinggangmycin, etc. 2-3 hours after eating will not interfere with the actual application effect. Using microbial strains to activate pesticides. Microbial pesticides will enhance their efficacy in continuous rainy weather. For example, bacteria, pathogenic pesticides, only in the case of high temperature, the reproduction speed will be accelerated, and the efficacy of pest control will be improved. Common microbial strains such as pesticide BT-78 1, Beauveria bassiana, Penicillium, etc.