1. Reasonable selection of pesticides Some pesticides (such as dimethoate) are greatly affected by temperature, and their efficacy is significantly weakened with the decrease of temperature, while some pesticides (such as omethoate) are less affected by temperature, even At lower temperatures (below 15 ° C), it also exerts its normal insecticidal action. Similar to omethoate, there is also a pyrethroid, which is more toxic at low temperatures (15 ° C) than at high temperatures (25 ° C). 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. Api 5l Q235b Steel Pipe,Api 5l Gr.b Q235b Steel Pipe,Psl2 Api 5l Q235b Steel Pipe Heavy Steel Pipe Co., Ltd , http://www.hzsteelpipe.com
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 the winter and spring season, prevent crop pests and diseases in the greenhouse, and apply the smoke method or dust method as much as possible. If the spray method is applied, the number of prevention and the amount of liquid spray should be appropriately reduced to prevent the humidity in 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. (ç»®å—)