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农药的种类很多,各有其有效的防治对象。那么,农药是通过什么途径进入虫体的?是怎样杀虫、防病和除草的?这就是农药的作用方式。一、杀虫剂的作用方式1.胃毒作用:药剂随着昆虫取食的食物一同进入消化系统,经肠道吸收使其中毒死亡。有胃毒作用的药剂称为胃毒剂,如砷酸钙、敌百虫、666等。这类药剂一般是通过处理昆虫加害的作物或制成毒饵、毒谷使用,适于防治咀嚼口器害虫,如蝗虫、粘虫、蝼蛄等;对蚜虫、介壳虫等刺吸口器害虫效果较差。
Many types of pesticides, each with its own effective control object. So, pesticides through what path into the worm? How insecticidal, disease prevention and weeding? This is the way pesticides. First, the mode of action of pesticides 1. Stomach poisoning: Pharmacy with food taken by insects into the digestive system, the intestinal absorption of poisoning death. A stomach poisoning agent known as stomach poison, such as calcium arsenate, trichlorfon, 666 and so on. Such agents are generally through the treatment of insect-harmed crops or made of bait, poison valley use, suitable for prevention and control of chewing mouth pests such as locusts, armyworms, slugs, etc .; for aphids, scale insects and other stinger suction mouth pests less effective .