After the pesticide is sprayed, its efficacy will be affected by temperature.
After the pesticide is sprayed, its efficacy will be affected by the temperature. The author reminds the farmers that the following five major issues should be noted when spraying pesticides at low temperature: 1. It is necessary to select pesticides when spraying pesticides at low temperature. 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 subject to temperature. The effect is small, even at lower temperatures, can play its normal insecticidal effect. Omethoate and other similar well fenvalerate, insecticide toxic effects at low temperatures but higher 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. Brass Gate Valve,Brass Ball,Gate Valves Jiekelong Precision Manufacturing Co., Ltd. , http://www.nbcoupling.com
In addition to these five major issues, other factors farmers should also pay attention to, so as not to affect the effect of pesticides, resulting in poor returns.