Screening some local and introduced cowpea cultivars for dry-seed yield and resistance to Callosobruchus maculatus (F) [electronic resource].

Includes reference.

Twenty-one cultivars of cowpea (Vigna unguiculata L. Walp) were screened for dry-seed yield and its components during two successive summer seasons (2004 and 2005) under Sohag conditions.there. were significant differences among cultivars for all studied characters. In addition, the twenty-one cultivars of cowpea were tested and screened for susceptibility to infestation by Callosobruchus maculatus (F.) in the laboratory condition. Results obtained for the cowpea seed beetle (C. maculatus)indicated a different response of the tested cultivar seeds in terms of preference and non preference. laid eggs, percentage of damaged seeds and emerges adults. developmental period, adult weight at emergence and seed weight loss due to Seeding by one larva when reared on seeds of the same cultivars. Cultivars IT 81 D-1064, IT 93 K 12904. and IT 82 D- 889 showed a significant degree of antixenosis, antibiosis and/or tolerance to infestation by C. maculatus. Therefore, these four cultivars may be useful for breeding programs of cowpeas towards producing new cultivars with high level of resistance/tolerance lo C. maculatus. It was concluded that the cultivar IT 93K 12904 Produced the highest total dry seed yield and was the most tolerant to C'. muculates.

Summary in Arabic.

Summary in Arabic.

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