Recently, the author's investigation has learned that some farmers spray pesticides without paying attention to the weather conditions, resulting in unsatisfactory effects or negative effects after application. Therefore, the application of the drug should pay attention to the weather.
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The weather conditions during the application of pesticides have a great impact on the efficacy of pesticides, the phytotoxicity of humans and plants, and the pollution of the surrounding environment. Rational use of weather conditions and mastery of scientific application techniques can prevent pesticides from causing harm to people and plants.
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Wang Jianhua, the station manager of the plant protection station in Luanchuan County, Henan Province, said that when applying pesticides, the weather should be selected according to the characteristics of pesticides. The effects of temperature on the toxicity of pesticides fall into two categories, one is the increase in toxicity with increasing temperature, and the other is the decrease in toxicity with increasing temperature. Temperature toxic effects, also have an impact on the efficacy, for example Bacillus thuringiensis (Bt) against the larvae, Plutella high control effect, when the temperature is lower than 20 ℃ control effect decreased over 20 ℃. The sulfur preparations are resistant to melon powdery mildew in the hot summer, which is prone to phytotoxicity. In severe cases, the whole plant will wither. Therefore, it is necessary to fully understand the characteristics of the selected agents, and appropriate use of effective agents should be used according to the prevention period and weather conditions.
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It is generally necessary to choose a sunny weather without wind. Vegetables in the shed should not be used in the rainy days to prevent the humidity from being too high to induce disease. It should be noted that when applied at high temperature, the pesticide is volatile, and the opportunity for the body to absorb pesticides is also increased. In addition, under the high temperature conditions, the metabolic function of the human body is enhanced, and the pesticide easily enters the human body and causes phytotoxicity.
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Therefore, it is necessary to apply the drug flexibly according to the weather. Generally, it is not suitable to use pesticides under windy conditions such as wind, rain, high temperature and high humidity. Otherwise, the efficacy will be reduced, and the chance of polluting the environment and causing phytotoxicity will be increased.
Author: Ren Zhenyu   Source of information: Farmers Daily
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