What kind of weather is most suitable for pesticide application during crop growth?

When controlling crop pests by injecting pesticides, we must pay attention to meteorological conditions in order to achieve good results, and we should pay attention to the following relations:

First of all, pay attention to the relationship between spray and rain. Generally speaking, when the dew is not dry in the morning, powder pesticides should be sprayed to make the powder adhere to the stems of crops and water-soluble pesticides should be sprayed. Dew spraying should be carried out after sunny days, so as not to dilute the pesticides with dew and reduce the efficacy. In addition, whether it is polishing or spraying, it is not recommended to run when it rains. Otherwise, pesticides will not have the effect of rain. Especially powder and wettable powder refresh most clearly.

Meteorological conditions that should be paid attention to when spraying pesticides

Secondly, pay attention to the relationship between spray and temperature. In general, the higher the temperature, the faster the chemical evaporation, the higher the permeability, so the higher the efficacy. At this time, the dosage or concentration of drugs should be reduced appropriately; Spray at room temperature and low temperature. Appropriate increase of drugs and concentration to improve the curative effect. However, when the temperature is too high, it is not suitable to spray, because the crops are generally exposed to the high temperature of the sun, and the drugs are easily volatilized and sometimes poisoned. High temperature will increase the decomposition of pesticides and the volatilization of drugs, so don't fight drugs at high temperature, because crops have strong inflammation, vigorous metabolism and open leaves, and drugs can easily enter criminals.

Meteorological conditions that should be paid attention to when spraying pesticides

Third, pay attention to the relationship between spray and wind direction. The wind has a great influence on spraying pesticides. When there is wind, the operator should be backward or leeward. Otherwise, it is difficult to ensure the accurate spraying of drugs. When the wind blows, it is easy to make the sprayed powder or droplets vibrate, which can not be evenly connected to the surface of crops, and it is also easy to poison users.

Meteorological conditions that should be paid attention to when spraying pesticides

Fourth, the application time. Avoid the high temperature period in hot weather. When the dew is not dry, the crop temperature within 10- 13 is relatively low, and the defects have not yet appeared. At this point, spraying is not good. The best time: before 9: 00 a.m., after 265438+ 0:00 p.m., the time can be adjusted appropriately according to the situation. Avoid using well water, because well water contains minerals such as calcium and magnesium, which is easy to react with chemicals.

Meteorological conditions that should be paid attention to when spraying pesticides

In a word, the suitable devices and methods for spraying pesticides must be determined according to meteorological conditions and different properties of various pesticides.