农作物病虫害发生时,有的农民由于掌握不准喷药的最佳时间,致使农药起不到杀虫灭病的应有作用。欲想提高药效、节省农药,就得掌握好喷药的最佳时间。夏季喷农药,无论是大田作物,还是林、果、蔬菜都应在上午8点半至10点半、下午四点半以后喷施。这两个时间为夏季喷药的最佳时间。因为上午8点半露水已干,温度还不太高,正是害虫取食、活动旺盛的 Pests and diseases of crops occur, some farmers because of the best time not allowed to spray, resulting in insecticide and pesticide disease should play a role. To improve efficacy, save pesticides, you have to get the best time to spray. Summer spraying of pesticides, whether field crops, or forest, fruit, vegetables should be in the morning 8:30 to 10:30, after half past four pm spraying. These two times for the summer spray the best time. Because half past eight dew has dried, the temperature is not too high, it is pests feeding, activity