Abstract
Cowpea ( Vigna unguiculata L. Walp) is rich in dietary protein and a relish in most West African countries. Four elite genotypes (IT 97K-499-35, lT 97K-568-18, IT 98K-131- 2 and IT 93K-452-2) emanating from the breeding programme of International Institute of Tropical Agriculture (11TA), Ibadan were therefore evaluated for their relative adaptations to a rainy season environment. A local variety was added as a check. The accessions were laid out in a randomized complete block design (RCBD) in two seasons (early and late) for two years (2009 and 2010) at DEMACCO Integrated Farms Ltd., AKO, Enugu state, Nigeria. The result revealed the presence of genotype x season interaction. Reproductive grain yield and insect damage on the crop differed significantly (p<0.05) between genotypes and/or season. Pod weight, 100-seed weight, grain weight, threshing percentage and harvest index of the late crop increased by 31%, 25%, 72%, 71% and 41% respectively over that of the early. Late season grain yields of IT 93K-131-2 (1177.0 kg ha -I
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