Generally speaking, the best time for spraying pesticides is: 8:00 to 10:00 in the morning and 5:00 to 7:00 in the afternoon. The summer weather is special. In many cases, it is not suitable for spraying pesticides. Let's get together to understand.
The first is windy days, which can easily cause poisoning by pesticides. The strong wind makes it easy for the sprayed powder or mist to fly in the wind. It can not be attached to the surface of the crop to exert its effects, and it will float on the pesticides, causing poisoning.
The second is rainy days, pesticides are easy to lose. Spraying on rainy days, rainwater can directly wash away the chemicals, which not only affects the effect, but also causes water pollution. Generally, the pesticide used for seed dressing is less affected by rainwater. The emulsifiable pesticide can form a layer of oil film on the surface of the crop, which has certain resistance to further rain washing, while the powder and wettable powder are the least resistant to rain.
The third is high temperature days, which are prone to phytotoxicity. High temperature will accelerate the decomposition of pesticides and evaporate faster. When crops are hot in hot weather, the pores are open, and the chemicals are easy to enter the crops and cause phytotoxicity.
The fourth is high humidity days, and the efficacy is reduced. In high temperature weather with heavy fog or dew, the agent is easily diluted by water to reduce the effect of the agent. In addition, the temperature is relatively low when the dew is not dry in the morning, and the pest has not come out yet, and the spraying effect is not good.
Tips: Well water contains calcium, magnesium and other minerals, many of which have chemical reactions with pesticides, so avoid using well water for medicine. If you want to get more knowledge about pesticides , please pay attention to China's pesticide network.
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