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Evaluation of susceptibility of varieties of cowpea to Callosobruchus maculatus and Callosobruchus subinnotatus



Evaluation of susceptibility of varieties of cowpea to Callosobruchus maculatus and Callosobruchus subinnotatus



Journal of Stored Products Research 29(3): 207-213



Twenty-six varieties of cowpea some of which are among those distributed for international trials by the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria were evaluated in comparison with Ife Brown, a known susceptible variety, for susceptibility to Callosobruchus maculatus (F.) and Callosobruchus subinnotatus (Pic.). The most susceptible varieties to C. maculatus were TVu 310, TVu 2896, TVu 9944 and TVu 9836. Some varieties were found to be moderately susceptible to C. subinnotatus and these included TVu 18, TVu 36, TVu 2896 and IT81D-1020. Most varieties were found to be more susceptible to C. maculatus than to C. subinnotatus. However, the median developmental periods of the bruchids on the cowpea varieties were comparable in most cases. Some varieties were found to be consistently less susceptible to attack by the two bruchids and these included TVu 2027, IT81D-1064, IT81D-1157 and IT86-498. The weight losses due to infestations by the bruchids correlated very strongly to the susceptibility indices (SI) of the varieties to the bruchids. The losses in weight caused by C. subinnotatus were comparable with those caused by C. maculatus even though the number of F1 adults of C. maculatus that emerged from the varieties was higher than those of C. subinnotatus.

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