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Entomopathogenic Nematodes (Rhabditida: Steinernematidae): Toxicity of Neem

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The effects of Margosan-O, a commercial neem-based insecticide, on the entomopathogenic nematode species Steinemema carpocapsae (Steiner), S. feltiae (Filipjev), and S. glaseri (Steiner) were examined in this study. Both acute and chronic toxicity were estimated, as were effects on nematode infectivity after incubation with the insecticide. Margosan-o was toxic to all 3 species, but only at much higher concentrations than the recommended field rate of 20 mg azadirachtin/liter water. The acute LC50 and 95% FL for S. carpacapsae exposed to Margosan-O was 425 (341-501) mg azadirachtin per liter. Chronic toxicity was not significantly different from acute toxicity until the 15th d of incubation. The acute LC50 and 95% FL for S. feltiae was 380 (340-443) mg azadirachtin per liter. Chronic toxicity values were not significantly different until day 15. The susceptibility of S. feltiae increased greatly between 12 and 15 d of incubation with Margosan-O. The acute LC50 and 95% FL for S. glaseri was 351 (330-370) mg azadirachtin per liter. Unlike the other 2 species, I detected no difference in susceptibility among incubation times for S. glaseri.. When the 3 species were compared, susceptibility to Margosan-O at LC50 at each incubation time interval was not significantly different until day 15. S. feltiae was significantly more susceptible than the other species after exposure to Margosan-O for 15 d. Infectivity [measured as the ability to kill greater wax moth larvae, Galleria mellonella (L.), contained in well plates], was reduced in all 3 species only when they had been incubated with Margosan-O at concentrations >200 mg azadirachtin per liter. When Margosan-O and nematodes were applied together at field rates to soil, infectivity was not reduced.

Document Type: Research Article

Publication date: February 1, 1996

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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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