The control effect of pesticides is often affected by the weather. Under climatic conditions such as wind, rain, high temperature and high humidity, the use of pesticides will affect the normal performance of the drug. Therefore, it is not advisable to apply pesticides under the above weather conditions. The reasons are as follows:
(1) It is not advisable to use a strong wind. Because of the windy weather, it is easy for the sprayed powder or the mist of the spray to fly with the wind, and it cannot fall and evenly adhere to the surface of the crop to be controlled. At the same time, the medicament drifts to the sensitive crops nearby, which may cause phytotoxicity and fall to the surface. It is easy to cause poisoning in the drug personnel, and it is easy to cause environmental pollution when it is dispersed into air and water. Even if some of the medicines reach the body surface of the crop to be controlled, the crops will be lost due to the strong wind and the branches and leaves shaking and rubbing.
(2) It is not suitable for spraying on cloudy or fast rainy days and rainy days . Because rainwater can directly wash away the pharmacy, causing loss, not only affects the control effect, but also causes pollution of river waters, leading to poisoning death of aquatic organisms such as fish and shrimp. Different pesticide varieties and dosage forms have different ability to resist rain erosion. Generally, systemic pesticides can be absorbed into the body by crops, and they are less affected by rainwater, especially for seed dressings. Rainwater has less impact on them. In the dosage form, the powder and the wettable powder are the least resistant to rain and are easily lost. The emulsifiable pesticide has a certain resistance to rain washing due to the formation of an oil film on the crop, but there are certain limits.
(3) High temperature weather is not suitable for application . High temperature will promote the decomposition of pesticides and accelerate the volatilization of pesticides, thus shortening the duration of pesticides and reducing the control effect. At the same time, due to the strong metabolism of crops in hot weather, the stomata of the leaves are open and large, and the medicament is easy to enter the crop body, and phytotoxicity occurs. Therefore, even if it is necessary to apply pesticides at high temperatures, the concentration of the agents should be appropriately reduced, and the drug should not be applied at noon as much as possible to avoid the occurrence of phytotoxicity and poisoning accidents of the pesticides.
(4) It is not suitable for application in high humidity weather . If the humidity in the air is large, the fog is heavy or the dew is too much, which may cause chemical decomposition of the pesticide, causing the medicament to fail or crop damage. However, microbial pesticides can be used at high temperatures to better exert their effects.
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