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Studies on Varietal Resistance of Cowpeas to the Cowpea Weevil, Callosobruchus rhodesianus (Pic)

Published online by Cambridge University Press:  19 September 2011

T. M. Ndlovu  and
D. P. Giga
T. M. Ndlovu
Affiliation:
Department of Crop Science, University of Zimbabwe, PO Box MP167, Harare
D. P. Giga*
Affiliation:
Department of Crop Science, University of Zimbabwe, PO Box MP167, Harare
*
† Author to whom correspondence should be addressed.
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Abstract

Eighteen cowpea varieties were evaluated for their resistance to cowpea weevil, Callosobruchus rhodesianus (Pic) infestation. The experiments were conducted at 27°C and 65–70% r.h. The varieties showed a differential response to infestation by C. rhodesianus with respect to oviposition, egg hatch, adult emergence, adult survival and development period. The intrinsic rates of increase and the indices of susceptibility of the varieties were estimated. The varieties were categorized into three groups of susceptibility (low, medium and high) to C. rhodesianus infestation based on the adult survival data. IT 82D-1064 and IT 81D-1032 were the least susceptible varieties.

Résumé

La résistance de 18 variètés de haricot, Vigna unguiculata à l'infestation de charancon, Callosobruchus rhodesianus (Pic) a été evaluée. L'expérience a été menée à la température de 27°C et l'humidité relative de 65–70 pour cent. L'oviposition, l'éclosion des oeufs, la production et la survie des adultes et la durée totale du developpement de C. rhodesianus varient en fonction de la variété de ce haricot. Le taux intrinsèque de croissance de C. rhodesianus et les indices de susceptibilité des variété ont été evalués. Sur le base de survie des adultes, de C. rhodesianus les variétés de haricot ont été groupées en trois catégories (bas, moyen, haut) en ce qui concerne leur prédisposition à l'infestation par C. rhodesianus. IT 82D-1064 et IT 81D-1032 sont les variétés moins susceptibles.

Keywords

Cowpea weevilCallosobruchus rhodesianusvarietysusceptibilityHaricotVigna unguiculatacharanconCallosobruchus rhodesianussusceptibilitévariétés
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 9 , Issue 1 , February 1988 , pp. 123 - 128
Copyright
Copyright © ICIPE 1988

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