【摘要】 本文用神经电生理方法研究了氰戊菊酯、氯菊酯对棉铃虫Helicoverpaarmigera（Hubner）相对敏感（HD－S）种群和抗性（HJ－R）种群的神经毒理作用。10－5mol／L的氰戊菊酯、10－5mol／L，的氯菊酯诱发腹神经索自发发放频率的增加和随后的神经传导阻断，10-4mol／L的氯菊酯抑制HD－S种群的神经兴奋，直接阻断神经传导。以兴奋时间、神经传导阻断时间、对药剂作用反应时间的个体分布频率3个参数比较两种群对杀虫剂的反应，均发现HJ－R种群比相对HD-S种群表现了2～3倍的神经不敏感机制，并且发现这种神经不敏感机制对毒理Ⅰ型和Ⅱ型拟除虫菊酯同样有作用。更多还原

【Abstract】 The effects of pyrethroids fenvalerate and permethrin were studies upon isolated abdominal nerve cords from the susceptible (HD-S) and resistant (HJ-R) strains of Helicoverpa armierra (Hubner). 10- 5 mol/L fenvalerate and 10-5 mol/L permethrin induced increases in spontaneous firing frequency primarily and then led to cessation in both strains;10-4 mol/L permethrin blocked the neural activity directly without producing repetitive discharges. On the basis of the time Of excitatiOn or cessation, there was a consistent pattern showing that the nervous systern of HJ-R is 2~3 times more resistant to pyrethroid actions than that of HD-S. This experiment implied that there is a resistant mechanism of decreased nervous sensitity to pyrethroids in the field strain of Heliothis armigera in China and the mechanism conferred resistance to type Ⅰ or Ⅱ pyrethroids.更多还原