第三章 杀虫杀螨剂

Key Lab of N. Pestic. SCAU 第三章杀虫杀螨剂 Key Lab of N. Pestic. SCAU (一)、杀虫剂进入虫体途径 1、口腔 2、体壁 3、气门第一节杀虫剂毒理学基础一、杀虫剂的穿透与在昆虫体内的分布 Key Lab of N. Pestic. SCAU 1. 从口腔进入胃毒剂需通过害虫取食才能起作用,内吸药剂进入植物体内,刺吸式害虫取食也属于胃毒作用。胃毒剂要求: 1 )、害虫不会拒食; 2 )、取食后不会引起呕吐。 Key Lab of N. Pestic. SCAU 空气进入体内的通道输送气体到器官、组织、细胞间。呼吸系统气管系统气门气门气管侧纵干背气管内脏气管腹气管微气管 2.气门进入 Key Lab of N. Pestic. SCAU Key Lab of N. Pestic. SCAU Key Lab of N. Pestic. SCAU Key Lab of N. Pestic. SCAU Spiracles of two insects. (A) Scanning electron micrograph of a fully open ant spiracle. The pointed projections are sensory hairs that monitor external conditions and can trigger spiracle closing when necessary. (B) A nearly closed grasshopper spiracle; the black areas are the valves. Key Lab of N. Pestic. SCAU 3.从体壁进入 Key Lab of N. Pestic. SCAU (二)杀虫剂的穿透