Effect of Callosobruchus maculatus (FAB.) (Coleoptera: Chysomelidae) infestation level on control using different particle sizes of Eugenia aromatic and piper guineense powders
Journal Title: Journal of Biodiversity and Environmental Sciences (JBES) - Year 2013, Vol 3, Issue 1
Abstract
Number of eggs population was used to measure initial infestation of Callosobruchus maculatus on cowpea seeds treated with Piper guineense and Eugenia aromatic powder. The treatment involves the use of P. guineense and E. aromatic of particle sizes of 150µm and 300 µm at the rate of 0.4g per 20g of cowpea seeds infested with different insect densities (0, 1, 3, 5, 8 and 10 pairs). The eggs laid on the seeds increased with increase in insect density. Significantly more eggs were laid on untreated seeds compared to seeds treated with botanical powder. Adult emergence increased significantly with increase in insect density on the seeds with P. guineense, irrespective of the particle size of powder applied. In E. aromatic treated seeds there were no adult emergence in seeds treated with 150µm particle size, except in the seeds with highest insect population treated with 300µm. seeds treated with 10 pairs of insect with 300µm also had low number of adult emergence irrespective of the particles size. The percentage weight loss of the treated and untreated seeds increased with increase in insect population in P. guineense treated seeds. However, no seed weight loss was recorded in 150 µm and 300µm particle sizes of E. aromatic except in the seeds infested with 10 pairs. Also the seed weight loss was significantly higher than that of seeds infested with different levels of insect population. This study shows the dependent of insect population and botanical particle size on control of C. maculatus.
Authors and Affiliations
J. E. Idoko, J. M. Adesina
Keywords
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