不同用药策略对抗性家蝇抗性演变的影响

据资料表明 ,目前大部分的农业、卫生害虫都已对一种或多种农药产生不同程度的抗性 ,而且几乎涉及所有类型农药 1 ] 。如何通过科学用药来抑制或延缓抗性种群的抗性发展 ,成为我们今后抗性治理的重点和难点。针对敏感和抗性初始频率较低的种群所采用的轮用、混用以及使用增效剂等用药策略对有一定抗性水平的抗性种群是否仍然奏效 ?针对这一问题 ,作者以对溴氰菊酯已产生中等抗性 ( R/ S=2 8.2 4)和高等抗性 ( R/ S=5 4.1 2 )的家蝇为试虫 ,采用轮用 (换用辛硫磷 )、混用 (辛硫磷与溴氰菊酯的混剂 )、使用增效剂(溴氰菊酯与增效磷混剂 )三…

Influence of Different Strategies of Pesticide Applications upon the Resistance Evolution of Resistant Houseflies ( Musca domestica L.)

Two housefly strains possessing moderate and high level resistance to deltamethrin were selected in laboratory under different strategies of pesticide applications, involving rotation, combination and addtion of synergist. The results revealed that resistance evolution of the housefly strain with moderate resistance level to deltamethrin was delayed by rotation and combination of insecticides. For the other housefly strain with high level resistance to deltamethrin, development of resistance to deltamethrin and selected insecticide was relatively slowed down by combination of insecticides. Resistance of two housefly strains to deltamethrin declined without contact with any insecticide, but the susceptibility to deltamethrin seems difficult to recover completely.