The pesticide network believes that no matter whether it is winter or spring or summer and autumn, it should avoid spraying pesticides at noon on sunny days. Because the high temperature at noon on sunny days can easily promote the decomposition of the drug and the evaporation of water in the liquid, the chemical activity of the agent becomes stronger when the weather is hot, and the toxicity of the pesticide becomes larger. Especially when spraying emulsifiable concentrates and various herbicides under high temperature conditions, it is easy to cause phytotoxicity and poisoning accidents of pesticides.
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Spray must avoid the high temperature period at noon. In the cold season of winter and spring, the application time of biological pesticides is preferably from 2:30 to 3:30 in the afternoon, and it is best not to use medicine in the morning. Because of the low temperature in the shed during the winter and spring seasons, the photosynthesis gradually enters the peak period after the morning leaves dew. If the spraying is bound to affect the temperature increase and reduce the photosynthetic efficiency, it is not suitable for medication in the morning. In the afternoon, it will not affect the temperature, which is beneficial to the prevention and treatment of diseases and insect pests. If you encounter winter and spring continuous sunny weather, when the temperature in the shed is high, you can also spray pesticides after 4 pm, which can also play a good bactericidal and pesticidal effect.
Vegetables should not be sprayed at noon
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