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Nature and significance of preflowering damage by thrips to cowpea

Author:
EZUEH, M.I.
Source:
Entomologia experimentalis et applicata 1981 v.29 no.3 pp. 305-312
ISSN:
0013-8703
Subject:
Megalurothrips sjostedti, Sericothrips, Vigna unguiculata, cowpeas, cultivars, flower buds, grains, planting, Nigeria
Abstract:
Two major species of thrips, Megalurothrips sjostedti Trybom and Sericothrips occipitalis Hood were found on cowpea, Vigna unguiculata (L.) Walp, Southern Nigeria throughout the year. Thrips populations were generally higher in the drier than the wetter months. The highest numbers occurred in August whilst the lowest were in June or July. When four cowpea cultivars were sampled monthly between April and November, 1976, there were no significant differences in the levels of infestation by thrips. M. sjosiedti destroyed flower buds extensively but caused significant depression in yield of dry grains only when infestations extended beyond 35 days after planting. It seems, therefore, that artificial control of thrips would be uneconomical before this point in crop development.
Agid:
80195