In the cold winter and spring season, many vegetable farmers will choose to spray drugs at the noon to prevent pests and diseases. Farmers believe that the temperature in the winter and spring sheds is low and the humidity is high. After spraying, the medicine can not be used quickly and better. At noon, the medicine is sprayed faster, and under the sunlight, the liquid is dried faster and can penetrate better. In the leaves, improve the effect of medication.
This kind of thinking is wrong. Whether it is winter or spring or summer and autumn, you should avoid taking medicine at noon on a sunny day. 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.
Spray must avoid the high temperature period at noon. In the cold season of winter and spring, the pesticide application time is appropriate from 2:30 to 3:30 pm, and it is best not to use the 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 it is in the continuous sunny weather in winter and spring, when the temperature in the shed is high, it can also be sprayed after 4 pm, which can also play a good bactericidal and insecticidal effect.
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