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Bruchid control with traditionally used insecticidal plants Hyptis spicigera and Cassia nigricans

Published online by Cambridge University Press:  19 September 2011

J. D. H. Lambert ,
J. Gale ,
J. T. Arnason  and
B. J. R. Philogene
J. D. H. Lambert
Affiliation:
Department of Biology, Carleton University, Ottawa K1S 5B6
J. Gale
Affiliation:
Department of Biology, Carleton University, Ottawa K1S 5B6
J. T. Arnason
Affiliation:
Department of Biology, University of Ottawa, Ottawa KIN 6N5, Canada
B. J. R. Philogene
Affiliation:
Department of Biology, University of Ottawa, Ottawa KIN 6N5, Canada
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Abstract

Losses of stored seed to insects in the tropics have reached levels of major concern. Synthetic insecticides, while effective, are generally very expensive for small fanners. The efficacy of two plants, Hyptis spicigera and Cassia nigricans, used by farmers to control insect infestation in stored cowpeas was determined. The oviposition and hatching of bean weevils (Acanthoscelides obtectus), under controlled environmental conditions, were reduced following treatment with EtOH extracts (1 g plant material 1 ml EtOH) at low application rates with EC50 between 0.3 and 14 μl extract/g bean. Further field studies are proposed to determine if such natural products can be further exploited to reduce stored legume losses.

Résumé

Les pertes causées par les insectes aux graines entreposées ont atteint un niveau d'alerte. Les insectcides synthétiques bien qu'efficaces sont généralement tres coûteux pour les petits planteurs. On a déterminé l'efficacité de deux plantes Hyptis spicigera et Cassia nigricans utilisées par les planteurs pour lutter contre les infestations d'insectes attaquant les pois blancs. L'oviposition et l'éclosion des charançons (Acanthoscelides objectus) à des conditions d'élevage contrôlées a été réduite suite à un traitement d'extraits alcooliques (un g/ml) à des doses faibles ayant une CE50, de 0.3–14 μl d'extrait par gramme de pois. Nous proposons des évaluations sur le terrain pour déterminer si l'on peut envisager l'utilisation de ce genre de produit naturel pour réduire les pertes en légumineuses emmagasinées.

Keywords

Bruchidinsecticidal plantsHyptisCassiaBruchidéeinsecticide planteursHyptisCassia
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 6 , Issue 2 , April 1985 , pp. 167 - 170
Copyright
Copyright © ICIPE 1985

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References

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