合理使用农药,能够提高药效,防止药害,并能节省农药,节约劳力,收到事半功倍的效果。那么,怎样使用农药效果好呢?1、要对症下药各种农药都有特定的生物活性,必须根据害虫的种类,选择最有效的农药,一般按农药“防治范围”使用即可。2、要适时用药病虫害各有其发生、发展的规律。一般来说,病 Rational use of pesticides, can improve efficacy, prevent injury, and can save pesticides, saving labor, receive a multiplier effect. So, how to use pesticide effect is good? 1, to prescribe a variety of pesticides have specific biological activity, we must choose the most effective pesticide according to the type of pest, generally according to the pesticide “control range” can be used. 2, to be timely drug pests and diseases have their own occurrence and development of the law. In general, sick