给庄稼喷施农药防治病虫害时，除了做到用药对路、浓度适当、注意安全外，还要注意气象因素对药效的影响，才能经济而有效地防治病虫害。气象因素，如温度、降水、风速等都会影响农药的药效。其中温度、湿度对药效影响最大。温度对药效的影响表现为害虫和病菌的生理活动和药剂 When pesticides are sprayed on crops to control pests and diseases, in addition to ensuring proper use of drugs and paying attention to safety, we must pay attention to the influence of meteorological factors on the efficacy of pesticides so as to economically and effectively control pests and diseases. Meteorological factors, such as temperature, precipitation, wind speed and so on, will affect the efficacy of pesticides. Which temperature, humidity, the greatest impact on the efficacy. The effects of temperature on efficacy are manifested as physiological activities and agents of pests and germs