Environmental Entomology (1985) 14, 776-779

D.L. Coudriet, N. Prabhaker and D.E. Meyerdirk (1985)
Sweetpotato whitefly (Homoptera: Aleyrodidae): Effects of neem-seed extract on oviposition and immature stages
Environmental Entomology 14 (6), 776-779
Abstract: Bioassays against the immature stages of the sweetpotato whitefly, Bemisia tabaci (Gennadius), were conducted with 0.2 and 2.0% aqueous solutions of neem-seed extract in laboratory and greenhouse studies. Cotton, Gossypium hirsutum L., foliage treated with neem-seed extract resulted in a reduction of egg viability and oviposition, prolonged larva periods, and larva mortality. Although the mode of action of the extract is unknown, we observed that adults were repelled, thus reducing oviposition. The failure of treated larvae to complete ecdysis would indicate an antiecdysteroid activity.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Dale Meyerdirk, Nilima Prabhaker

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Bemisia tabaci	Cotton (Gossypium)