阿维菌素对小菜蛾的生物活性研究

Biological toxicity of Avermectin to Plutella xylostella

测定了阿维菌素对小菜蛾幼虫的胃毒毒力、对卵的触杀毒力、对成虫寿命及产卵量的影响 ,以及温度对阿维菌素毒力的影响。结果表明 ,田间小菜蛾种群对阿维菌素极为敏感 ,阿维菌素对小菜蛾幼虫的毒力显著高于常规的杀虫剂 ;阿维菌素对小菜蛾卵不具触杀毒力 ,对成虫寿命及产卵量无明显的影响 ;温度对阿维菌素的毒力有较大的影响 ,在 15～ 32℃温度范围内 ,阿维菌素对小菜蛾幼虫的毒力随着温度的升高而增强 ,温度从 15℃上升到 32℃ ,阿维菌素对小菜蛾幼虫的毒力增加了 32倍。

The stomach poisoning of Avermectin to the second instar larva of Plutella xylostella ,contract poisoning to egg,the effect of Avermectin on adult lifespan and on mean number egg,and the effect of temperature on Avermectin toxicity were determined.The studies on the biological activity of Avermectin to Plutella xylostella showed that field population of Plutella xylostella were more sensitive to Avermectin than to certain common\|used insecticides.Avermectin had no contract poisoning toxicity to eggs and the effect on adult lifespan and mean number of eggs of Plutella xylostella was not significant.Temperature showed significant effect on the toxicity of Avermectin to the second instar larva of Plutella xylostella. The toxicity become greater as temperature ranged from 15-32℃.At 15-32℃,the toxicity of Avermectin to the larva of Plutella xylostella increased by 32 times.