朱砂叶螨抗药性研究

1986～1987年测定了河南省12个产棉县、市棉田朱砂叶螨对当前主要杀螨剂的抗性水平和多种农药对抗性叶螨的毒力水平.结果显示,朱砂叶螨已对三氯杀螨醇和氧化乐果产生抗性,各棉区基本处于抗性上升阶段.其中对三氯杀螨醇的抗性相对倍数较高,LC_(50)和LC_(95)值分别是相对敏感品系的1.72～8.26和3.47～17.67倍.从抗性品系对23种农药的感受性看出,朱砂叶螨已形成对硫磷高抗品系,抗性倍数达466.8倍;对磷胺、久效磷等也表现较高的抗性,但对甲氰菊酯、PP321、克螨特等尚未产生明显抗性,三环锡、Nissorun、毒死蜱、来福灵等有较好的杀若螨作用,对卵的抑制作用以Nissorun为最强,其次为浏阳霉素和杀虫脒.

Investigation of Carmine Spider Mite(Tetranychus cinnabarinus) Resistance to Insecticides

Carmine spider mite is one of the most important pest insects of cotton in Henan Province. Resistance of the mite to insecticides was studied during 1986-1987. Susceptibilities of thirteen strains of the mite collected from different cotton areas to two principal acaricides-dicofol and omethoate were determined by slide dip method. The result showed that the resistance had appeared almost all cotton counties sampled. The toxicities of 23 kinds of selective pesticides to the female adult of susceptible strain (Baiquan strain) and resistance strain (Xinxiang strain) were eveluated still by the slide dip method. The strain of Xinxiang had a high degree of resistance to organoph-osphor, especially parathion ( 466.8-fold at LC50), but no resistances were found tomethrin, PP321, plictran, propargite, ect.