What is the principle of pesticide spraying in rainy season?

Check the weather forecast every day in rainy season, and spray pesticides when it doesn't rain. Pay attention to the weather changes at any time and be flexible when spraying. Generally speaking, the effect of pesticide application after rain is good. Therefore, the appropriate time period can be selected according to the weather and actual situation to improve the control effect. Choose the application time according to the activity law of pests. Moth pests, such as leaf roller moths, are active at night and should be applied at night.

In rainy season, it is best to choose protective agents, inhalants and anti-scour agents, followed by microbial pesticides. Bactericide is sprayed on the surface of plants before the infection of bacteria to play a protective role. Even if the pathogen reappears, it can't infect plants. Such as Bordeaux mixture, Fu Mei and Dyson. Highly effective insecticides have strong contact killing and fumigation effects. Pests can be killed in a few hours, which can effectively avoid reducing the efficacy due to rain erosion.

Inhaled pesticides can enter plants through roots, stems, leaves and other parts of crops, and can be transported to other parts for more than 5 hours, and can be absorbed by crops by 80%. The effective components have a short action time and are less affected by precipitation. Applying fungicides to plants infected by pathogenic bacteria can inhibit the growth and even death of pathogenic bacteria, reduce the harm of plants and even restore health. Pesticide fungicides with classic control effects are mostly endogenous agents, such as carbendazim, metoprolol, difenoconazole, propiconazole and zhongshengmycin. Internal-absorption fungicides such as metalaxyl, aluminum triethylphosphonate and tropine have bidirectional internal absorption and conduction functions, which play a particularly superior role in prevention and control.

Attention should be paid to changing the use of pesticides in rainy season. For example, when inhaled pesticides are used, they should be mixed into fine soil before pests occur and then applied to the soil near crops. Let plants absorb pesticides, and let pests absorb pesticides and die. This method is one of the comparison methods used in rainy season. At the same time, according to the activity law of pests, the application time is reasonably selected. For example, some nocturnal pests should be used at night and sunrise pests should be used in the morning.