In the high summer season in midsummer, many farmers like to apply pesticides at high temperatures during the noon. It is believed that high temperatures can increase the effect of killing pests and diseases, but the results are counter-productive and more harmful.
Poor insecticidal effect
Judging from the habits of many insects, there are quite a few pests that are active in the evening or at night, such as rice borers, cotton bollworms, and ground tigers. Most of the pests are afraid of light and are afraid of heat. They will hide under bright light at noon. As a result, the application of high temperature at noon is less effective than that in the evening.
Reduce the effectiveness of the liquid
Pesticide liquids are generally volatile and easily decomposed. At high temperatures at noon, the molecular activities in the air are relatively active. If the pesticides are applied at this time, the liquids will quickly evaporate and transpire with the air molecules, so the drug efficacy time is short. .
It is easy to bring injury to crops
At noon high temperatures, the stomata of the crop's body surface are open, breathing is vigorous, and evaporation of water is intensified. At this time, the pesticide, powder or acid and alkali components in the medicament are applied to the stomata of the leaf and stem of the crop to increase the water supply burden of the crop, destroy the physiological function and organization of the crop, and cause the young part of the crop to produce "wilting" or "burning" of the leaves. spot".
Not good for human health
At midsummer midsummer, the low air temperature in fields is usually above 35°C. If the field is small, the pesticides will evaporate into the air during the continuous application process, which will increase the concentration of drug-containing molecules in the air. These contaminated poisoned air passes through the respiratory tract or pores. Entering the human body and working at high temperatures reduce the resistance of the human body. As a result, pesticide poisoning and heat stroke syndromes are often generated, which can easily lead to life-threatening injuries. Occurrences of accidental poisoning occur from time to time.
Therefore, in order to improve the effectiveness of pesticides in preventing and controlling diseases and pests and to reduce the phytotoxicity to crops and to ensure the safety of pesticide applicators, it is advisable to avoid spraying in high temperature environments at noon.
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