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Species range and abundance of insect predators of the bean aphid, Aphis fabae Scop. (Homoptera: Aphididae) on common beans in Kenya

Published online by Cambridge University Press:  19 September 2011

Morris W. Ogenga-Latigo
Morris W. Ogenga-Latigo
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), P.O. Box 30772, Nairobi, Kenya
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Abstract

The diversity and abundance of insect predators of the bean aphid, Aphis fabae Scop. (Homoptera: Aphididae) on common beans, Phaseolus vulgaris L., were evaluated in Central Kenya. Predators included species in the Orders Coleoptera, Diptera, Hemiptera and Neuroptera. Coccinellidae were the most abundant and diverse group and several species, such as Hippodamia variegata Goeze and Platynaspis capicola Crotch, had hitherto not been recorded on common beans in Kenya. Higher numbers of predators developed on beans during the short rains (up to 540/100 m2 plot) as compared to the long rain season (182/plot) of 1985. In both seasons, numbers of coccinellid larvae were high after the fourth week of bean growth. The study provides evidence of an important build-up of insect predators on beans.

Résumé

La diversite et l'abundance des insectes predateurs de l'aphide du haricot, Aphis fabae Scop. (Homoptera: Aphididae) etaient evaluees sur le haricot commun dans le Kenya Central. Les especes des predateurs comptaient les membres des ordres des Coleoptera, Diptera, Hemiptera et Neuroptera. La famille des Coccinellidae constituaint le group le plus abondant et le plus diversive dont plusieurs especes telles que Hippodamia variegata Goeze et Platynaspis capicola Crotch n'etaient pas encore reportees sur le haricot commun au Kenya. En 1985, la densite de population des predateurs la plus elevee (jusqu'a 540 insectes/ parcelle de 100 m2) etait abservee pendant la petite saison des pluies par comparaison a la grande saison a laquelle correpondait une densite d'environ 182 insectes par parcelle. Pendant les deux saisons, le nombre de larves des coccinellides etait plus eleve apres la quatrieme semaine de vegetation. Cette etude fourmit la preuve d'un important developement des insectes predateurs sur le haricot.

Keywords

Insect predatorsCoccinellidaebean aphidAphis fabae Scop.common beansPhaseolus vulgaris L.
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 15 , Issue 1 , February 1994 , pp. 55 - 59
Copyright
Copyright © ICIPE 1994

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