Winter and spring vegetables should not be sprayed at noon

In the cold winter and spring season, many vegetable farmers choose to spray insect pests at noon. Farmers believe that the temperature in the winter and spring sheds is relatively low and the humidity is relatively high. After spraying, they cannot exert their efficacy quickly and well. At noon, they spray medicines. Under the irradiation of sunlight, the liquids dry faster and can penetrate better. In the leaves, improve the effect of medication.

This idea is wrong. No matter whether it is winter or spring or summer or autumn, it should avoid medication in sunny days. Because the high temperature at noon on the sunny day facilitates the decomposition of the drug and the volatilization of water in the liquid, the chemical activity of the drug becomes stronger when the weather is hotter, and the toxicity of the pesticide also becomes greater. Especially when sprayed with emulsifiable concentrate and various herbicides at high temperatures, it is very prone to phytotoxicity and pesticide poisoning.

Spraying must avoid high temperatures during noon. In the cold season of winter and spring, pesticide application time is suitable from 2:30 to 3:30 in the afternoon, and it is best not to use medication in the morning. Because the winter and spring seasons, the greenhouse temperature is low, dew in the morning after the retreat, the photosynthesis gradually entered the peak period, if spraying will inevitably affect the temperature, reduce the photosynthetic efficiency, so the morning should not be medication. The use of medication in the afternoon will not affect the temperature, which is conducive to the prevention and treatment of diseases and insect pests. If it encounters continuous sunny weather in winter and spring, when the temperature inside the shed is high, it can also be sprayed after 4 pm, which can also play a very good sterilization effect.

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