Biological Effects of Neem (Azadirachta indica) Seed Oil on an Egg Parasitoid, Trichogramma chilonis
Authors: Raguraman, S.; Singh, R. P.
Source: Journal of Economic Entomology, Volume 92, Number 6, December 1999 , pp. 1274-1280(7)
Publisher: Entomological Society of America
Abstract:Neem seed oil was tested at concentrations of 5.0, 2.5, 1.2, 0.6, and 0.3% for oviposition deterrence, feeding deterrence, toxicity, sterility and insect growth regulator effects against Trichogramma chilonis Ishii. Neem seed oil at 0.3% deterred oviposition (parasitization) by the parasitoid, but the sensitivity varied considerably both under choice and no-choice conditions. Neem seed oil also deterred feeding at or above 1.2% concentration both in choice and no-choice tests. In feeding toxicity tests, neem seed oil at 5% concentration caused <50% mortality to both males and females but in contact toxicity tests, females were affected sparing males. No sterility effect was observed when the parasitoid was fed with neem seed oil-treated honey. Both pre- and posttreatment of host eggs revealed no adverse effects on the development of the parasitoid. In view of the sensitivity of the parasitoid adults to oviposition deterrent and (mild) toxic effects of neem seed oil, it is suggested that for inundative release of the parasitoid T. chilonis pretreatment of the crop with neem extracts should be avoided.
Document Type: Research Article
Publication date: December 1, 1999
- 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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