Why should we spray pesticides in the morning and evening in hot weather?

There is a simple reason. If the pesticide is sprayed at noon in hot weather, it will affect the pesticide, increase volatilization, and lead to the failure to give full play to the efficacy. Water and medicine are fully mixed and then sprayed with pesticides. At noon, the temperature is too high. If we spray them, the water will evaporate easily and will soon be dried by the sun. The residue time of these drugs on crops will be greatly shortened, which is not conducive to the absorption of pesticides by crops and to the prevention and control of diseases and pests.

We only spray pesticides to cure diseases and kill insects. Many insects don't come out at noon and basically hide. After all, insects move in the morning and evening. We only choose to spray pesticides when insects are active, then the effect will be very obvious. If you choose to hide at noon, spraying pesticides will not have much effect.

Spraying pesticides at high temperature at noon is easy to cause phytotoxicity. In fact, at noon, the temperature is very high and the crops are basically in a state of heat dissipation. If the pesticide is sprayed at this time, the water of the pesticide is either warm or cold, and the pesticide will have a physical reaction when it comes into contact with crops. When high temperature meets low temperature, it will naturally affect the growth of crops, and it may be easy to burn spots or even roots, so we will choose to use pesticides sooner or later.

Spraying pesticides in the morning and evening has great benefits. The temperature in the morning is not high, which is more beneficial for crops to absorb these pesticides, and can play a good role in preventing some bacterial diseases and killing insects. Pesticide spraying on crops needs an absorption time, which is about 3-4 hours. When the temperature is not high, it is often better to absorb. Generally speaking, the absorption between 20-30 degrees is more appropriate, and more than 30 degrees will often be affected.