In the high temperature season in summer, many farmers like to apply medicine at high temperature during noon. It is believed that high temperature can improve the effect of killing pests and diseases, but the result is counterproductive and harmful.
 First, the insecticidal effect is poor
From the living habits of many insects, a considerable number of pests are active in the evening or at night, such as rice blast, cotton bollworm, and ground tiger, and most of the pests are afraid of light and heat, and will hide under noon light. Therefore, the application of high temperature at noon is less effective than the application in the evening.
Second, reduce the effectiveness of the liquid
Pesticide liquids generally have the characteristics of being volatile and easily decomposed. At high temperature at noon, the molecular activity in the air is relatively active. If the drug is applied at this time, the liquid is easily evaporated and transpiration with air molecules, so the drug effect time is short. .
Third, it is easy to bring phytotoxicity to crops
At high temperatures at noon, the stomata of the crop surface open, the breathing is strong, and the evaporation of water is intensified. At this time, the powder or acid-base component in the medicament is applied to the stomata of the crop leaf stalk, increasing the burden of crop water supply, destroying the physiological function and organization of the crop, causing the young part of the crop to produce "wilty" or the leaves to be "burned". spot".
Fourth, it is not good for human health
At noon in midsummer, the low air temperature in the field is usually above 35 °C. If the wind in the field is small, during the continuous application process, the pesticide will be volatilized into the air, so that the concentration of the drug-containing molecules in the air is increased. These polluted air passes through the respiratory tract or capillary. Entering the human body, combined with high temperature operation, the body's resistance is reduced, so the syndrome of pesticide poisoning and heat stroke often occurs, which is easy to cause life-threatening. Every year, accidents due to poisoning of the application occur.
Therefore, in order to improve the effectiveness of pesticides to control pests and diseases, as well as to reduce the phytotoxicity of crops and to ensure the safety of pesticides, it is necessary to avoid application in high temperature environment at noon, and it is advisable to apply medicine on cloudy or sunny days.
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Monomers Oligomers,Cas 108-45-2,M-Phenylenediamin In Stock,108-45-2 99%
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