The weather conditions when applying pesticides have a great impact on the efficacy of pesticides, the harm of people and plants, and the pollution of the surrounding environment. Only when the weather conditions are reasonably used and scientific application techniques are mastered can the maximum extent be achieved. To prevent the harm of pesticides to humans and plants, it can achieve the effect of saving labor and medicine. 1. Reasonable selection of pesticides Some pesticides (such as dimethoate, etc.) are greatly affected by temperature, and their efficacy decreases significantly with decreasing temperature, while some pesticides (such as omethoate, etc.) are less affected by temperature, even if At lower temperatures, it can also exert its normal insecticidal action. Similar to omethoate and cypermethrin, the toxicity of the insecticide at low temperatures is higher than at high temperatures. Therefore, in winter and spring cold seasons to prevent crop pests and diseases, we must pay attention to pesticides that are less affected by temperature. 2. Appropriately increase the dosage of pesticides in the low-temperature season, increase the dosage and increase the concentration of the liquid medicine under the guidance of professionals, but it must not exceed the “safety high concentration†(ie, the maximum allowable dosage for which no phytotoxicity occurs). 3. When the application temperature is high during sunny high-temperature period, the range and respiratory intensity of pests increase, and the amount of food intake increases. At this time, application of pesticides will improve the control effect. 4. Improve the pesticide application method In the winter and spring seasons, pests and diseases in greenhouses should be prevented and treated. Smoke or dust should be used as far as possible. If spray application is used, the frequency of control and spray volume should be appropriately reduced to prevent humidity in the greenhouse. 5. Appropriately extend safety intervals During low-temperature seasons, the degradation rate of pesticides is slow, and the time left in the crops is relatively long. It is necessary to appropriately extend the number of days from the last application of crops to harvesting (that is, the safety interval) to ensure food safety.
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