Effect of Citrus sinensis peel oil on the oviposition and development of cowpea beetle Callosobruchus maculatus (Coleoptera: Chrysomelidae) in some legume grains
2015
Ekeh, F.N. (University of Nigeria, Enugu State (Nigeria). Dept. of Zoology and Environmental Biology) | Oleru, K.I. (University of Nigeria, Enugu State (Nigeria). Dept. of Zoology and Environmental Biology) | Ivoke, N. (University of Nigeria, Enugu State (Nigeria). Dept. of Zoology and Environmental Biology) | Nwani, C.D. | Eyo, J.E.
The present study was undertaken to study the effect of Citrus sinensis peel oil on the oviposition and development of Callosobruchus maculatus in some legume grains. Oviposition deterrency and F1 adult emergence were carried out with split plot design of six concentrations (0.25, 0.5, 0.75, 1.0, 1.5, 2.0 ml) replicated four times on Cowpea, bambara groundnut and pigeon pea against C. maculatus. The phytochemical study of C. sinensis peel oil revealed that B - pinene and limonene were the most active ingredients with percentage chemical contents of 9.3 and 70 respectively. The mean developmental periods of C. maculatus in the selected legumes showed significant differences while the percentage emergence of beetle was highest in Cowpea (95%) followed by bambara groundnut (84%) and pigeon pea (68%). The sex ratio of emerged C. maculatus in the three legumes showed that more females than males were emerged, and emergence (%) was higher in Cowpea than other legumes. The mean fecundity in the three legumes showed that C. maculatus was most fecund (137.8 plus minus 23.44) in Cowpea, followed by bambara groundnut (131.2 plus minus 34.24) and pigeon pea (99.0 plus minus 24.4). Maximum deterrent activity in oviposition and adult emergence was observed at 1.5 to 2.0 ml peel oil treatment in all the grain types. Based on this study C. sinensis peel oil could be suggested for use to suppress populations of C. maculatus for short to moderate periods of storage.
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