Pest Management Science (2007) 63, 381-387

Liande Wang, Jian Huang, Minsheng You, Xiong Guan and Bo Liu (2007)
Toxicity and feeding deterrence of crude toxin extracts of Lecanicillium (Verticillium) lecanii (Hyphomycetes) against sweet potato whitefly, Bemisia tabaci (Homoptera: Aleyrodidae)
Pest Management Science 63 (4), 381-387
Abstract: Crude toxins [toxin_V3450 and toxin_Vp28, extracted from Lecanicillium (Verticillium) lecanii (Zimmermann) Gams and 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).
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Liande Wang, Xiong Guan, Minsheng You

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
molecular biology - genes

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Bemisia tabaci
Akanthomyces lecanii (entomopathogen)	Bemisia tabaci