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(一)掌握药剂性能。每种农药都有自己的适用特点。如胃毒剂一般只对咀嚼式口器的害虫有效,而对剌吸式口器的害虫效力不大,甚至无效。有些药剂遇到碱性物质就要分解失效,另外药剂的浓度、配制方法等,都不同程度影响药效。 (二)了解害虫特点。不同害虫对同一种药剂的反应不同,同种害虫不同龄期对药剂的反应也不同。一般蛹和卵期对药剂的抵抗力最强;幼虫和成虫期对药剂的抵抗力较弱;成龄幼虫的抗药力较幼
(A) master the performance of pharmaceuticals. Each pesticide has its own applicable characteristics. Such as stomach poisons generally only chewing mouthparts pests effective, while the assassination mouthparts pests little effect, or even invalid. Some agents encountered decomposition of alkaline substances will ineffective, and the concentration of other drugs, preparation methods, all affect the efficacy of varying degrees. (B) understand pest characteristics. Different pests respond differently to the same agent, and the responses of different pests to different agents at different ages are also different. Generally pupa and egg period of the strongest resistance to pesticides; larvae and adult stage of the resistance of the drug is weak; adult larvae more resistant