1. It is understood that some pesticides (such as dimethoate) need to be used reasonably when spraying pesticides at low temperature. The effects of the pesticides are greatly affected by temperature, and their effects are significantly weakened with the decrease of temperature, while some pesticides (such as omethoate, etc.) It is less affected by temperature and can exert its normal insecticidal action even at lower temperatures. Similar to omethoate, there is also a pyrethroid, which is more toxic at low temperatures than at high temperatures. Therefore, in winter and spring low temperature seasons to control crop pests and diseases, we must pay attention to the use of pesticides with less temperature impact.
2. Appropriately increase the dosage of pesticides in the low temperature season. Under the guidance of professionals, increase the dosage and increase the concentration of the liquid, but not exceed the “safe high concentration†(ie, the maximum allowable dose without phytotoxicity).
3. When the application temperature is high during high temperature and high temperature, the activity range and respiratory intensity of the pest increase, and the feeding amount increases. At this time, the application is beneficial to improve the control effect.
4, improve the application method in winter and spring to prevent greenhouse crop pests and diseases , try to use the smoke method or dust method to apply; if spray application, the appropriate number of prevention and discharge, to prevent the humidity inside the shed.
5. Properly extend the safe interval. In the low temperature season, the degradation rate of pesticides is slow, and the residual time in the crops is relatively long. The number of days (ie, the safety interval) of the last application of the crops must be appropriately extended to ensure food safety.
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