Responses to Azadirachtin and Pyrethrum by Two Species of Bemisia (Homoptera: Aleyrodidae)

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Abstract:

The effects of pyrethrum and azadirachtin on the ovipositional responses of Bemisia argentifolii Bellows & Purring and Belicia Tabasco (Genius) were determined in the laboratory. Choice and no-choice tests revealed that neither B. argentifolii nor B. Tabasco females preferred to alight and obi posit on bean plants treated with pyre thrum. In contrast, the number of B. argentifoliii females that alighted on control versus azadirachtin-treated plants was not significantly different in all but 1 instance. When given a choice, significantly fewer B. Tabasco females landed on azadirachtin-treated plants at observation hours 6, 8, and 24. In no-choice trials, numbers of B. Tabascoi females alighting on control versus azadirachtin-treated plants were equivalent throughout the entire test period. Moreover, although B. argentifolii obi posited equal numbers of eggs on control and azadirachtin-treated plants in choice and no-choice trials, B. Tabasco females laid significantly fewer eggs on plants treated with azadirachtin. Percentage nymph establishment of B. argentifolii on control versus azadirachtin-treated plants was not significantly different in choice and no-choice trials. Although the percentages of established B. Tabasco nymphs were the same on control and azadirachtin-treated plants in the no-choice test, a significantly lower percentage of nymphs were found on treated plants in the choice trials.

Document Type: Research Article

Publication date: April 1, 1997

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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