In winter and early spring, the temperature is low. When controlling crop pests and diseases , we must pay attention to the rational application of pesticides. Rational use of pesticides Some pesticides (such as dimethoate) are greatly affected by temperature, their efficacy is significantly reduced with the decrease of temperature, and some pesticides (such as omethoate) are less affected by temperature, even at lower At normal temperatures (below 15 ° C), it also exerts its normal insecticidal action. Omethoate and other similar well fenvalerate, insecticide toxic effects at a low temperature (15 ℃) but higher than the temperature at (25 ℃). 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. Appropriate increase in dosage In the low temperature season, the pesticide should be properly increased under the guidance of a professional to increase the concentration of the liquid, but not to exceed the "safe high concentration" (ie, the maximum allowable dose without phytotoxicity). Improved application method In the winter, the pests and diseases of greenhouse crops should be controlled by the smoke method or the dust method. 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 from being too large. Properly extend the security interval In the low temperature season, the degradation rate of pesticides is slow, and the time remaining in the crops is relatively long. It is necessary to appropriately extend the number of days (ie, the safety interval) of the last application of the crops to ensure safe food. The above information is compiled by China Pesticide Information Network. Please indicate the source. Thread Cnc Lathe Machine,Thread Lathe Machine,Cnc Automatic Lathe Machine,Automatic Wood Lathe Machine Shaoxing Sunfong Intelligent Equipment Inc. , https://www.zjsxsunfong.com