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当农作物发生病虫害时,有些农民朋友用上年未用完的剩余农药防治作物病虫害,结果不是没有防治效果,就是发生药害现象。为什么会出现这种现象呢?究其原因,大致有四个方面:一是对用剩的农药保管不当而变质。二是农药超过了保质期。三是对没有了标签的农药估着用。四是将用剩的几种农药混装在一起。前两种情况导致没有防治效果,后两种情况造成药害。笔者提醒农民朋友,在使用剩农药
When pests and diseases occur in crops, some peasant friends prevent crop pests and diseases with the remaining pesticides that have not been used in the previous year. As a result, they are not without their prevention and control effects and are thus causing phytotoxicity. Why does this phenomenon appear? The reason, there are about four aspects: First, the remaining pesticide improper storage and deterioration. Second, the pesticide exceeded the shelf life. Third, there is no labeling of pesticides used to estimate. Fourth, the remaining pesticides mixed together. The first two cases lead to no control effect, the latter two cases cause injury. I remind peasant friends, the use of pesticide left