Journal of Stored Products and Postharvest Research
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Article Number - 41BCC158443


Vol.1(3), pp. 24-28 , December 2010

ISSN: 2141-6567



Full Length Research Paper

The effect of time of harvest on the damage caused by the cowpea weevil Callosobruchus maculatus (Fab.) (Coleoptera: Bruchidae)


P. K. Baidoo1*, M. B. Mochiah2 and M. Owusu -Akyaw2




1Department of Theoretical and Applied Biology, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.

2Entomology Section, Crop Research Institute, P. O Box 3785, Kumasi Ghana.


Email: pkbaidoo2002@yahoo.com






 Accepted: 26 October 2010  Published: 31 December 2010

Copyright © 2010 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


The effect of time of harvest on the level of damage caused by Callosobruchus maculatus on cowpea was studied. Cowpea (Vigna unguiculata) (variety Asontem) was planted on 9 raised beds each measuring 2.4 x 2.4 m, 3 each for early, mid and late harvests that is, 60,70 and 80 days after germination respectively. Each plot had 20 plant stands. The plants were sprayed with PAWA (Lambda cyhalothrin) at 5 weeks after germination and with Cymethoate at flower bud and pod formation stages. Harvesting was done by hand-picking pods from the inner rows of plants. The harvested pods were sun-dried and the seeds were removed and stored in sealed transparent bottles. The number of adult weevils emerging were collected and counted weekly for 8 weeks. Percent weight loss, damaged seeds and seed holes were noted for each harvest time. Mean number of emerged adults ranged from 1.7 for 60 days of harvest to 136.7 for 80 days of harvest. Significantly higher % damage was recorded for the 80 days harvest than the 60 and 70 days harvest (P= 0.0001). Percent weight loss for the different harvest times however did not differ significantly (P=0.571). Prompt harvest of matured cowpea pods would reduce the destruction of stored cowpea by C. maculatus. 

Key words: Callosobruchus maculatus, cowpea, damaged seeds, holes, weight loss.


APA (2010). The effect of time of harvest on the damage caused by the cowpea weevil Callosobruchus maculatus (Fab.) (Coleoptera: Bruchidae). Journal of Stored Products and Postharvest Research, 1(3), 24-28.
Chicago P. K. Baidoo, M. B. Mochiah and M. Owusu -Akyaw. "The effect of time of harvest on the damage caused by the cowpea weevil Callosobruchus maculatus (Fab.) (Coleoptera: Bruchidae)." Journal of Stored Products and Postharvest Research 1, no. 3 (2010): 24-28.
MLA P. K. Baidoo, M. B. Mochiah and M. Owusu -Akyaw. "The effect of time of harvest on the damage caused by the cowpea weevil Callosobruchus maculatus (Fab.) (Coleoptera: Bruchidae)." Journal of Stored Products and Postharvest Research 1.3 (2010): 24-28.
   
DOI
URL http://academicjournals.org/journal/JSPPR/article-abstract/41BCC158443

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