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期 刊 ：植物保护学报 2011年

关键词：酶抑制剂；杀虫剂；甜菜夜蛾；斜纹夜蛾；

Keywords:enzyme inhibitor, insecticide, Spodoptera exigua, Spodoptera litura,

摘 要 ：采用点滴法比较了甲维盐、虫螨腈、茚虫威、虫酰肼、毒死蜱、灭多威对甜菜夜蛾和斜纹夜蛾3龄幼虫的室内毒力,以及酶抑制剂与防治甜菜夜蛾和斜纹夜蛾杀虫剂的互作效应。结果表明,甲维盐、虫螨腈、茚虫威对2种试虫毒力较高,LC₅₀值介于0.69 ~16.32 μg/g之间;虫酰肼对甜菜夜蛾毒力较高,LC₅₀值为37.66 μg/g;毒死蜱对斜纹夜蛾毒力较高,LC₅₀值为20.71 μg/g。酶抑制剂PBO、 TPP、 DEM、 SV₁在甜菜夜蛾和斜纹夜蛾上对虫螨腈和茚虫威均表现为抑制作用, 增效比在0.25~0.96之间;而这4种酶抑制剂在甜菜夜蛾上对甲维盐和虫酰肼以及在斜纹夜蛾上对甲维盐和毒死蜱表现为增效作用,除SV₁在斜纹夜蛾上对毒死蜱增效倍数高达16.20外,其它组合增效倍数均介于1.22~4.20之间。

Abstract:To understand the interaction of enzyme inhibitors with insecticides on Spodoptera exigua (Hübner) and Spodoptera litura (Fabricius), the laboratory toxicities of emamectin benzoate, chlorfenapyr, indoxacarb, chlorpyrifos, tebufenozide and methomyl on the 3-instars of S.exigua and S.litura were determined using topical application. The results indicated that the relative toxicities of emamectin benzoate, chlorfenapyr and indoxacarb were high on S.exigua and S.litura with the LC₅₀ range between 0.69 μg/g and 16.32 μg/g, while only chlorpyrifos showed high toxicity to S.litura and tebufenozide to S.exigua with LC₅₀ 37.66 μg/g and 20.71 μg/g, respectively. The results of interaction of enzyme inhibitors with insecticides indicated that four different enzyme inhibitors of PBO, TPP, DEM, and SV₁ showed significant restraint to chlorfenapyr and indoxacarb with the synergism ratio between 0.25 and 0.96, while showed synergism to emamectin benzoate, tebufenozide on S.exigua and emamectin benzoate, chlorpyrifos on S.litura with the synergism ratio between 1.22 and 16.2.

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