Response of Ootheca bennigseni (Coleoptera: Chrysomelidae) to Extracts from Neem

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Various formulations of neem (Azadirachta indica A. Juss)extract were evaluated under field and greenhouse conditions to examine the effects of foliar beetle, Ootheca bennigseni Weise,a serious pest of beans and other legumes in many parts of Africa. At concentrations of 2.0 and 4.0%, neem formulations from seed kernels deterred O. bennigseni from feeding bean leaves. None of the neem formulations protected bean plots completely. However, formulations of neem seed kernel extract resulted in lower foliar damage and less incidence of O. bennigsenithan other formulations. In most instances, untreated leaves were severely damaged, whereas leaves protected with neem extracts were not attacked or were only slightly damaged. Residual effectiveness of various neem extracts varied considerably; residual activity was shorter with lower concentrations. In greenhouse studies, 1.0% aqueous leaf and seed kernel extracts were highly active as an antifeedant against O. bennigseni, which consumed little or none of the leaves. In free-choice experiments, bean seedlings treated with 1.0 and 2.0% neem seed kernel extracts were well protected. Because of their effectiveness,safety for the environment, lower cost, availability, and easy preparation, neem extracts have great potential in protecting beans against foliar beetles on beans.

Document Type: Research Article

Publication date: December 1, 1989

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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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