七星瓢虫不同虫态对杀虫剂反应的研究初报

室内条件下对七星瓢虫(Coccinella septempunctata)卵、幼虫、蛹和成虫的触杀毒力测定结果表明,不同发育阶段的七星瓢虫对抗蚜威、伏杀磷和久效磷的反应一致;与对照药剂久效磷相比:①抗蚜威、伏杀磷处理七星瓢虫卵120小时的相对毒力指数分别为0.0483和0.3187;②抗蚜威和伏杀磷对七星瓢虫四龄幼虫24小时的相对毒力指数分别为0.1088和0.4056;③抗蚜威和伏杀磷处理蛹216小时的相对毒力指教分别为0.0540和0.5990;④抗蚜威和伏杀磷对瓢虫成虫24小时的相对毒力指数分别为0.1406和0.0623。可见,与常规使用的杀虫剂久效磷相比,抗蚜威和伏杀磷对七星瓢虫的各种虫态均具有高度选择性。

PRELIMINARY STUDIES ON REACTIONS OF DIFFERENT DEVELOPMENTAL STAGES OF COCCINELLA SEPTEMPUNCTATA TO INSECTICIDES

Reactions of different developmental stages of Coccinella septempunctata to Pirimicarb, phosalone and monocrotophos were in laboratory. With the monocrotophos used as a reference, the indices of relative toxicity of pirimicarb and phosalone treated eggs at 120 h were 0.0483 and 0.3187, respectively; those of the larvae at 24 h Were 0.1088 and 0.4056, respectively; those of the pupae at 216 h were 0.0540 and 0.5990, respectively; and those of the adults at 24 h were 0.1406 and 0.0623, respectively, pirimicarb and phosalone were high selective to the eggs, larvae, pupae and adults of C, septempunctata.