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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 9, No. 1, 2005, pp. 169-172
Bioline Code: ja05032
Full paper language: English
Document type: Research Article
Document available free of charge

Journal of Applied Sciences and Environmental Management, Vol. 9, No. 1, 2005, pp. 169-172

 en Effect of the Infection of Callosobruchus maculatus check for this species in other resources (Fab.) on the Weight Loss of Stored Cowpea ( Vigna unguiculata check for this species in other resources (L.) Walp)
O.C. UMEOZOR

Abstract

Market survey and laboratory experiments were conducted to obtain more reliable estimates of cowpea weight loss caused by individual Callosobruchus maculatus check for this species in other resources . In both the market survey and laboratory experiments, a highly significant inverse linear relationship existed between C. maculatus feeding/emergence holes and cowpea weight loss (P<0.001, linear correlation coefficients (r) = -0.322,-0.959, and -0.921, for the market survey, laboratory experiments 1 and 2, respectively). Cowpea weight losses were 0.026g, 0.015g, and 0.016g per individual C. maculatus in the market survey, laboratory experiments 1 and 2, respectively while the highest number of C. maculatus feeding/emergence holes was 188, 1669, and 2028 per 200 cowpea seeds for the market survey, laboratory experiments 1 and 2, respectively. This is an important component in the establishment of an Economic Injury Level (EIL) for C. maculatus on V. unguiculata. @JASEM

 
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