摘要
八十年代初,氰戊菊酯对棉花蚜虫有极优异的防效,但由于抗药性的产生和发展,氰戊菊酯100和200ppm 对一般棉蚜药后2天仅有40%的药效,药后5天蚜量已增加,对伏蚜无效.但药后10天棉田主要天敌仍比药前少30%.对棉叶螨的药效好于棉蚜.并刺激棉蚜的繁殖.所以在棉田单独使用氰戊菊酯后,使棉蚜基本处在既无竞争者又无捕食者的良好的生态环境中,使其大量增殖,引起再增猖獗.丰收菊酯是复配农药,对棉蚜、棉叶螨和棉田主要天敌有较均匀的药效和毒力,不刺激繁殖,使用后可将生态环境中的棉蚜、棉叶螨和棉田主要天敌控制在原比例的最低密度状态.
In early 1980′s,the fenvalerate could control cotton aphid very well.Because of resistance development of the aphid to fenvalerate,the pesticide failed to control the aphid. 100 and 200 ppm fcnvalerate only killed about 40% aphid 2 days after spraying and the amount of the aphid increased 5 days after spraying.The concentration could stimulate the reproduction of the aphid and did not kill any cotton aphid in summer.But the concentration of fenvalerate could control cotton red mite(Tetranychus cinnabarinus Kock)and kill the en- emy of the pests.So after spraying of fenvalerate in cotton field,the aphid was in the envi- ronment with few competitors and predators,and resurgent and increased quickly.The com- bination of fenvalerate and monocrotophos did not stimulate the reproduction of the pests, and could kill aphid,red mite and enemy of the pests equally and maintain the ratio of them at the lowest density in circumstance.
出处
《华东昆虫学报》
1992年第2期56-63,共8页
Entomological Journal of East China
