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International Journal of Tropical Insect Science (1)

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Studies on Varietal Resistance of Cowpeas to the Cowpea Weevil, Callosobruchus rhodesianus (Pic)
T. M. Ndlovu, D. P. Giga
Journal:

Insect Science and Its Application / Volume 9 / Issue 1 / February 1988

Published online by Cambridge University Press:

19 September 2011, pp. 123-128

Print publication:

February 1988
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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.