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Field and laboratory trials using a locally produced neem insecticide against the Sahelian grasshopper, Kraussaria angulifera (Orthoptera: Acrididae), on millet in Mali

Published online by Cambridge University Press:  10 July 2009

J. Passerini  and
S. B. Hill
J. Passerini*
Affiliation:
Department of Entomology, McGill University, Montreal, Canada
S. B. Hill
Affiliation:
Department of Entomology, McGill University, Montreal, Canada
*
J. Passerini & S.B. Hill, Macdonald Campus, McGill University, 21 111 Lakeshore, Ste-Anne-de-Bellevue, Quebec, H9X 3V9, Canada.
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Abstract

Field and laboratory trials were undertaken to determine effects and efficacy of neem extracts on the Sahelian grasshopper, Kraussaria angulifera (Krauss). Formulations of aqueous extracts were sprayed in field experiments. Concentrations of 0.5% and 1% were effective in reducing grasshopper feeding. Neem kernel powder applied systematically, partially protected millet against K. angulifera. The residual activity of the botanical insecticide was at least seven days. Analysis of plant selection behaviour showed that neem is primarily an antifeedant rather than a repellent for this insect. On first to third instar nymphs, growth regulating activity, expressed as difficulty in moulting or an incompleteness of sclerotization, may occur.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 83 , Issue 1 , March 1993 , pp. 121 - 126
Copyright
Copyright © Cambridge University Press 1993

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