The association between some physico-chemical characteristics and susceptibility of cowpea (Vigna unguiculata (L.) Walp) to Callosobruchus maculatus (F.)
1996
Oigiangbe, N.O. | Onigbinde, A.O.
The association between some physical characteristics and the tannin content of cowpea (V. unguiculata), and the susceptibility of the beans to bruchid (C. maculatus) infestation was investigated. The physical characteristics were the coat colour and texture, seed height, length and width, and the thickness of the seed coat. The dimensional parameters show significant (P < 0.05) correlation with the number of eggs laid with the seed height accounting for about 70% of the variance. The same parameter accounted for 77% of the variance in the number of F1 progeny. The tannic acid content, however, becomes increasingly significant with the growth of the larvae to adulthood. The tannic acid content accounted for 14.3 and 39.9% of the variance in the number of F1 progeny and percentage adult emergence, respectively.
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