Winter and spring vegetables fight drugs should avoid noon
In the cold winter and spring season, many vegetable farmers choose to spray pesticides at noon to prevent and treat pests and diseases, because it is widely believed that under the irradiation of noon sunlight, the sprayed liquids will dry faster and penetrate better into the leaves, thus increasing Medication effect. In fact, this idea is wrong. Whether in winter or spring and summer or autumn, medication should be avoided at noon on a sunny day because the high temperature at noon on sunny days facilitates the decomposition of the drug and the volatilization of water in the liquid. The chemical activity of the drug becomes stronger, and the toxicity of the pesticide becomes relatively large. . Especially when sprayed with emulsifiable oils and herbicides at high temperatures, it is more prone to phytotoxicity and pesticide poisoning.
In the cold season of winter and spring, spraying pesticides should be selected from 2:30 to 3:30 in the afternoon. It is best not to use drugs in the morning. Due to the low temperature in the shed during the winter and spring seasons, after the dew on the leaves in the morning, photosynthesis gradually entered the peak period, and spraying will inevitably affect the increase of temperature and reduce the photosynthetic efficiency. Afternoon medication has little effect on temperature, which is conducive to the prevention and treatment of diseases and insect pests. If continuous sunny weather is encountered in the winter and spring seasons, and the temperature in the shed is high, it can also be sprayed after 4 pm, which can also exert good bactericidal and insecticidal effects.
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