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夏季喷施农药,无论是棉花、蔬菜、果树,应当以上午8点至10点,下午5点前后为最好。这是因为上午九点左右,露水已干,温度还不太高,正是日出性害虫取食、活动最旺盛的时侯,这时用药不会因为有露水冲淡药液浓度,不会因温度过高使农药分解,降低药效,可使害虫增加食药、触药的机会。下午四点以后,太阳偏西,光线渐弱,夜出性害虫即将开始活动,这时喷施农药,害虫在黄昏或夜间出来活动或取食,也有较高的杀灭效率。
Spraying pesticides in summer, whether it is cotton, vegetables, fruit trees, should be 8 am to 10 am, 5 pm before and after the best. This is because around 9:00 am, the dew has been dry, the temperature is not too high, it is feeding sunrise pests, activities, the most vigorous when the medication will not be diluted with dew liquid concentration, not because of The temperature is too high to pesticide decomposition, reduce efficacy, pests can increase the chances of food, medicine. After four o’clock in the afternoon, the sun west, the light faded, night pests are about to start activities, spraying pesticides, pests in the evening or night activities or feeding out, but also higher killing efficiency.