Crop Protection & Environmental Biology

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End date: 2009Subject: search.filters.subject.Cowpea

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    Response of vigna unguiculata.(L.) Walp. and amaranthus cruentus (L.) Thell to interference from acalypha segetalis mull arg. on marginal lands in southwestern Nigeria
    (2001) Ogunyem, S.; Awodoyin, R. O; Osunkoya, O.O; Olubode, O.S.; Wewe, O.F.
    The role of each weeds depends on weed type, density and duration of association with the crop as well as competitive ability of the crop. In open garden experiments, the phenology of Acalypha segetalis, a common weed of arable and ruderal habitats in south western Nigeria, and its influence on the growth and performance of Vigna unguiculata and Amaranthus cruentus, were investigated in 1999 and 2000. Acalypha segetalis was found to be slow growing in the first four weeks of its life cycle but developed rapidly and vigorously afterwords. It produced and shed seeds within 10 weeks of growth. Vigna unguiculata, which is highly susceptible to weed infestation in the first four weeks of growth, did not suffer significant growth and yield reductions from the association with j4 ca/yp/ia segetalis. However, Amaranthus cruentus, which has similar growth habits with the weed, suffered significant reductions in growth and yield. Amaranthus suffered up to 42% marketable yield loss when grown with Acalypha. The early slow growth of Acalypha determines its competitive potential in arable cropping systems. Crops that establish fast and with superior early growth ability may not suffer adverse competitive repression with the weed.
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    Reduced Morphological Root Features of Anthracnose Infected Cowpeas (Vigna unguiculata (I.) Walp)
    (2002) Ajari, I. O.; Fadina, O.O
    ln a green house experiment to determine the effects of anthracnose disease caused by collectricum lindemuthianum on cowpea, sterilized siols in planting pots were used for planning two susceptible cowpea varieties (Ife Brown and 1782-60). The seedlings were inoculated with the inoculum meal of the pathogen after 3 weeks of planting. The results obtained show that characteristics tan to brown anthracnose symptoms had appeared on the leaves of both varieties after 3 weeks of inoculation, while the roots of the infected cowpeas were observed to be morphologically different from the roots of the uninfected plants. Similarly, infected plants were smaller in size and a marked reduction in their yield IT82f 60 (35%) versus Ife Brown (19%). The reduction of the plant structures and yield of the infected plants was suspected to have been as a result of the anthracnose disease
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    Screening of cowpea varieties for resistance to brown blotch fungal disease
    (2006) Ajibade, S. R.; Owolade, O. F.; Balogun, M. O.; Fadare, T. A.
    Seventy-one cowpea varieties were screened in the field out of which nine resistant varieties were selected and these were further evaluated for resistance to cowpea brown blotch disease caused by Collectorichnm capsicl under artificial inoculation. The results showed that the cowpea variety IT95k- 193-12 appeared to be the most resistant to brown blotch disease. Artificial inoculation seemed to be more effective in identifying resistant genotypes as most of the cowpea varieties with moderate resistance in the field were highly susceptible under artificial inoculation.