Temperature and pesticide application 10M Measuring Tape,Large Tape Measure,Longest Tape Measure,Black Tape Measure SHANGQIU CHAOYUE MEASURING TOOLS CO., LTD , https://www.equipmentool.com
High heat tends to promote the decomposition of the drug and the volatilization of the active ingredient of the drug. When the weather is hot, the chemical activity of the drug becomes stronger, and the toxicity of the pesticide becomes larger. The crops are vigorous in hot weather, and the stomata on the leaves are open and large, and the medicinal spray is easy to invade into the crop body, causing damage. The above phenomenon occurs when the stone sulphur mixture, emulsifiable concentrate and various herbicides are used under high temperature conditions. Therefore, in hot and hot weather, try not to apply medicine, especially at noon. Do not apply medicine at noon. For example, the concentration used should be smaller to prevent phytotoxicity and poisoning accidents. The optimum time for pesticide application should be selected on sunny days 8 to 10 am and after 4 pm. Because the temperature is not high at this time, the wind is small, and the air above the plant has an inversion layer, so that the medicine can not fly, and can be evenly sprinkled on the plant. Thereby improving the efficacy and reducing the phytotoxicity.
In addition, in the hot season, the laws of pest and disease activities have certain characteristics. For example, many pests (rice planthopper, rice leafhopper, etc.) have the habit of yin and yang, and tend to concentrate on the lower part of the plant or the back of the plant, while the disease mostly invades from the stomata and the lower leaves. At the same time, in the hot season, pests proliferate faster and resistance is enhanced. Therefore, when applying in the hot season, it is necessary to determine the spraying position according to the hazard characteristics of the pests, master the optimal spraying timing, pay attention to checking the efficacy, properly change the pesticides , reduce the resistance of pests and diseases, and improve the control effect.
What effect does temperature have on pesticides?