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 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 tigers, and most of the pests are afraid of light and are afraid of heat. Under the irradiation, it will hide. Therefore, the application of high temperature at noon is worse than that in the evening.

Reducing the effectiveness of liquid medicines The pesticide liquids are generally volatile and easily decomposable. At high temperatures at noon, the molecular activities in the air are relatively active. If the pesticides are applied at this time, the liquid chemicals will quickly evaporate and evaporate with the air molecules. Short drug efficacy.

When it is easy to bring phytotoxicity to crops at high temperatures in the noon, the stomata of the crop's body surface are open, and the air is vigorous and the water evaporation 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".

Detrimental to human health At midday in summer, the low air temperature in fields is often as high as 35°C. If the wind in the field is small, the pesticides will evaporate into the air during the continuous application process, which will increase the concentration of drug molecules in the air. These contaminated air passes through Respiratory tract or capillary pores enter the human body and work under high temperature causes a decline in the body's resistance. As a result, pesticide poisoning and heat stroke syndromes are often generated, which can easily lead to life-threatening accidents.

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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