What are the methods to improve the efficacy in rainy season?

Summer is rainy and rainy, and the temperature is high. At this time, spraying pesticides on crops to control pests and diseases will endanger the control effect. The following methods can reduce the harm of continuous rain to medicinal properties. 1. Selection of promotion type. In rainy weather, it is effective to use internal inhalation, quick-acting and emulsifiable concentrate pesticides to prevent diseases. For example, pesticides such as carbofuran and dimethoate, pesticides and fungicides such as triadimefon, isoprothiolane and metalaxyl, and herbicides such as glyphosate, gramoxone and herbicides, after several hours of application, most of the drugs are digested and absorbed by the main stems and leaves and enter tissues.

Even if it encounters a rainstorm, it will not cause harm to the medicine. Quick-acting pesticides, such as most pyrethroid pesticides, have strong contact killing and fumigation effects, and will have a high practical effect of repelling insects a few hours after application. Emulsifiable pesticides, such as 50% dimethoate, can produce a layer of oil slick on the epidermis of green plants after application, which improves the ability of pesticides to resist precipitation and washing.

2. Add an appropriate amount of adhesive. Adhesives can improve the adhesion ability of drugs and enhance the ability of drugs to resist precipitation and washing. According to different kinds of pesticides, adhesives should be added respectively. Appropriate amount of high-viscosity soybean flour and wheat flour can be added to granular pesticides, and water-soluble adhesives such as small animal bone glue and epoxy resin can be added to wettable powders and liquid pesticides, which can further improve the actual effect of pesticide application.

3. Improve the application technology. According to the characteristics of drugs, appropriate application methods can be adopted, such as carbofuran and omethoate, and root zone application methods can be selected to prevent rain erosion. It can also be sprayed moderately according to the living habits of pests, such as feeding by leaf roller at night, and the actual effect is better. It is very effective to apply pesticide in the morning for downy mildew of Chinese cabbage that releases spore nodes at night and in the morning. If we can seize the gap between rain and apply quick-acting pesticides, we can also get good practical results.

The above is my detailed introduction. I hope it will help you and solve the problem as soon as possible.