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1 October 2011 Effects of Selected Defoliants in Combination with Insecticides on the Sweetpotato Whitefly (Hemiptera: Aleyrodidae) and Its Parasitoids in Cotton
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Abstract
Cotton defoliation is an important management practice associated with high-yielding, high-quality cotton. The impacts of two commonly-used defoliants (tribufos and thidiazuron) individually and in combination with two commonly-used insecticides (lambda-cyhalothrin and azinphosmethyl) on the sweetpotato whitefly, Bemisia tabaci Gennadius biotype B (= silverleaf whitefly, Bemisia argentifolii Bellows & Perring) and its parasitoids were determined in field studies in the Lower Rio Grande Valley of Texas. The two defoliants and their combinations with azinphosmethyl and lambda-cyhalothrin significantly affected the occurrence and survival of sweetpotato whiteflies and their parasitoids, Encarsia spp. and Eretmocerus spp., although the effects varied among the treatment combinations. Lambda-cyhalothrin alone had no significant effects on sweetpotato whitefly and its parasitoids. Combining defoliants and insecticides appears to be a potential management tool for whiteflies on cotton.
T.-X. Liu and S. M. Greenberg "Effects of Selected Defoliants in Combination with Insecticides on the Sweetpotato Whitefly (Hemiptera: Aleyrodidae) and Its Parasitoids in Cotton," Journal of Entomological Science 46(4), (1 October 2011). https://doi.org/10.18474/0749-8004-46.4.308
Received: 20 January 2011; Accepted: 1 April 2011; Published: 1 October 2011
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