应用叶片保护率评价阿维菌素对小菜蛾的毒力  

Toxicity Assessment of Avermectin on Diamondback Moth,Plutella xylostella(Linnaeus)by Means of Leaf Protection Rate

作　　者：田素芬[1] 顾晓军[1] 刘文静[1] 王德辉[1] 

机构地区：[1]福建农林大学应用生态研究所,福州350002

出　　处：《中国农学通报》2008年第12期396-400,共5页Chinese Agricultural Science Bulletin

基　　金：福建农林大学青年教师基金"小菜蛾Hsp70表达;热刺激反应特性及其应用基础研究"(B0403);福建省自然科学基金"热休克蛋白(Hsp70)在小菜蛾生态控制中的应用基础研究"(B0410015);福建省青年科技人才创新项目"小菜蛾适合度监测指标的研究"(2004J010);福建省教育厅项目"农药对小菜蛾内分泌干扰效应及其增效途径研究"(2007F5021);福建省高等学校新世纪优秀人才支持计划资助

摘　　要：采用叶片保护率评价阿维菌素对小菜蛾(Plutella xylostella(Linnaeus))2龄、3龄幼虫的毒力,以期为该药毒力的准确评价提供资料。浸叶法测定阿维菌素对小菜蛾2龄、3龄幼虫室内毒力的同时,观察记录24h、48h、72h校正死亡率、叶片保护率。对小菜蛾2龄幼虫,24h、48h、72h的LC50分别为>10.00mg/L、2.87mg/L、0.56mg/L;相同时间内PC50分别为0.25mg/L、0.82mg/L、1.43mg/L。对3龄幼虫,24h、48h、72h的LC50分别为>10.00mg/L、6.20mg/L、3.00mg/L;相同时间内PC50分别为<0.16mg/L、0.04mg/L、4.25mg/L。根据叶片保护率,可以发现阿维菌素对小菜蛾影响快,但是当阿维菌素毒力达到稳定时,必须有较高的校正死亡率,否则达不到理想的叶面保护效果。To provide data for more accurate toxicity assessment of avermectin on diamond back moth,Plutella xylostella（Linnaeus）,the leaf protection role of avermectin was studied.The toxicity was tested by leaf-dipping method and the corrected mortality and leaf protection rate at 24 h、48 h or 72 h were calculated.For the 2nd instar larvae,the LC50s at 24 h,48 h and 72 h were 〉10.00 mg/L,2.87 mg/L and 0.56 mg/L,respectively.The PC50s at the respective duration were 0.25 mg/L、0.82 mg/L and 1.43 mg/L,respectively.Meanwhile,for the 3rd instar larvae,the LC50s at 24h、48h and 72h were 〉10.00 mg/L、6.20 mg/L and 3.00 mg/L,respectively and the PC50s at the respective duration were 0.25 mg/L,0.82 mg/L and1.43 mg/L,respectively.Based on the leaf protection rate,the effect of avermectin on the tested insects came out quickly after treatment.But the corrected mortality should reach a high level while the toxicity became stable,otherwise the leaf protection effect would not be well enough.

关 键 词：小菜蛾(Plutella xylostella(Linnaeus)) 阿维菌素 校正死亡率 叶片保护率 

分 类 号：S481.1[农业科学—农药学]