农药混用具有提高功效、扩大使用范围、延缓抗药性甚至增加药效、减少用量、降低成本、减轻毒性等优点。便于现混现用的,如乳油和可湿性粉剂,就可以现混现用。不便于现混现用的,如粉剂和拌种剂,则制成混剂比较合适。近年来国外农药混剂品种、数量都有增加的趋势。以日本为例,1972年杀虫混剂占全部杀虫剂的24.9%, Mixed with pesticides to improve efficacy, expand the scope of use, delay the resistance or even increase efficacy, reduce dosage, reduce costs, reduce toxicity and so on. Easy to use now mix, such as EC and wettable powder, you can mix now. Not easy to mix the current use, such as powder and seed dressing, then made more appropriate mixture. In recent years, foreign pesticide mixture varieties, the number has increased. In Japan, for example, insecticide mixture accounted for 24.9% of all pesticides in 1972,