| 摘要: |
| 国产25％灭幼脲Ⅲ号胶悬剂在供试浓度范围内(0.25—250ppm)对菜粉蝶(Pierisrapae L.)有较强的生物活性。可抑制卵的孵化并引起初孵幼虫死亡,幼虫龄期愈小对药剂愈敏感。幼虫死亡多发生在脱皮和化蛹阶段。少数幼虫进入蛹期后继续死亡或不能正常羽化,呈“半蛹一半成虫”态。幼虫期浸体法施药效果好于浸叶饲喂法。受药幼虫几丁质合成受抑,含量减少,内表皮变薄并出现剥离和断裂,脂肪体碎裂、崩坏以至消失。 |
| 关键词: 灭幼脲Ⅲ号,菜粉蝶,卵,幼虫,生物活性,毒性,内表皮,脂肪体 |
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| BIOACTIVITY TEST WITH NO.Ⅲ MIEYOUNIAO AGAINST EGG AND LARVA OF Pierisrapae L. |
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Wang Feng kui Lui Man Zhang Qiaoying
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| Abstract: |
| The 25％ colloidal suspension of No.Ⅲ Mieyouniao--an insect chitin synthesis innibitor,in its rest concentration range of 0.25-250 ppm in lab test has a high bioactive against Pierisrapae L.It can prevent its eggs from hatching and cause the 1st-5th instar larvae to die.The yonger the larva is,the more sensitive to its toxicity the larva is.The death of larvae occured chiefly during the moulting and pupating stages.After a few larvar cmoe into the pupating stage,they continue to die or they can not emerge appearing to be in the state of "half pupa and half adult".In the larva stage,the effect of application of suspension of No.Ⅲ Mieyouniao by dipping is better than that by feeding them with leaves soaked.Thus,the synthesis of chitin in the poisoned larvae is inhibited with its contents reduced so that the endocuticle of poisoned larvae become thinner,denudated and broken.Also,the fat-bodies become denuated,broken and disappeared. |
| Key words: No.Ⅲ mieyouniao (insect chitin synthesis inhibitor) Pierisrapae L.,egg,larva,bioactivity,toxicity,endocuticle fat body |
