In winter, the temperature is low. In the prevention and control of crop diseases and insect pests, we must pay attention to the rational use of pesticides.
Rational selection of pesticides Some pesticides (such as dimethoate, etc.) are greatly affected by temperature, their efficacy decreases significantly with decreasing temperature, while some pesticides (such as omethoate, etc.) are less affected by temperature, even if At low temperatures (below 15°C), it can also exert its normal insecticidal action. Similar to omethoate and cypermethrin, the toxicity of this insecticide at low temperatures (15°C) is higher than at high temperatures (25°C). 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.
Appropriate increase in the amount of pesticides used in the low-temperature season, to increase the dosage and increase the concentration of the liquid medicine under the guidance of a professional, but not exceeding the "safety high concentration" (ie, the maximum allowable dosage of the drug that does not occur).
Improve the application of pesticides in winter and spring seasons to control greenhouse pests and diseases, as far as possible the use of smog or dust method of spraying; if the spray method of spraying, to reduce the number of control and spray volume, to prevent excessive humidity in the shed.
Properly extended safety intervals During the cold season, 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 (ie, safety intervals) to ensure food safety.
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