Toxicity and feeding deterrence of crude toxin extracts of Lecanicillium (Verticillium) lecanii (Hyphomycetes) against sweet potato whitefly, Bemisia tabaci (Homoptera : Aleyrodidae)
文献类型： 外文期刊
作者： Wang, Liande 1 ; Huang, Jian 2 ; You, Minsheng 2 ; Guan, Xiong 2 ; Liu, Bo 2 ;
作者机构： 1.Fujian Agr & Forestry Univ, Fac Plant Protect, MOE, Inst Appl Ecol,Key Lab Biopesticide & Chem Biol, Fuzhou 350002, Peoples R China
2.Fujian Agr & Forestry Univ, Fac Plant Protect, MOE, Inst Appl Ecol,Key Lab Biopesticide & Chem Biol, Fuzhou 350002, Peoples R China; Fujian Acad Agr Sci, Inst Biotechnol, Fuzhou, Peoples R China
关键词： Lecanicillium (Verticillium) lecanii;toxins;toxicity;antifeedant activity;Bemisia tabaci
期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：4.845； 五年影响因子：4.674 ）
ISSN： 1526-498X
年卷期： 2007 年 63 卷 4 期
页码：
收录情况： SCI
摘要： Crude toxins [toxin(V3450) and toxin(vp28), extracted from Lecanicillium (Verticillium) lecanii (Zimmermann) Gams & Zare strain V3450 and Vp28 respectively] were tested for contact toxicity, feeding deterrence and repellent activity against the sweet potato whitefly, Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae). Both toxins showed ovicidal activity to eggs, with LC50 values of 447 and 629 mg L-1 respectively. Nymphs of B. tabaci were the most susceptible stages (LC50 values were calculated at 111 mg L-1 for toxin(V3450) and 216 mg L-1 for toxin(vp28)), and adults were the second most susceptible stages (48 h LC50 values were calculated at 178 mg L-1 for toxin(V3450) and 438 mg L-1 for toxin(vp28)). Applied to seedlings at a concentration of 400 mg L-1, the toxins significantly (P < 0.001) reduced the hatching of whitefly eggs and the subsequent survival rate of the nymphs, and the emergence and fecundity of the progeny adults. Both toxins exhibited repellent activity at low concentration (100 mg L-1), with repellency index (RI) values of 0.645 for toxin(V3450) and 0.642 for toxin(vp28), and antifeedant activity at high concentration (1000 mg L-1) to adults, with antifeedant index (AFI) values of 0.713 for toxin(V3450) and 0.749 for toxin(Vp28). The results of the present study demonstrate the toxicity, repellence and antifeedant properties of the fungi metabolite toxins on B. tabaci, which might develop as environmentally friendly plant protectant(s). (c) 2007 Society of Chemical Industry.
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