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Asian Journal of Plant Sciences
Year: 2006  |  Volume: 5  |  Issue: 3  |  Page No.: 547 - 552

The Use of Vegetable Oils in the Control of Callosobruchus maculatus (F) (Coleoptera: Bruchidae) in Three Cowpea Varieties

K.E. Law-Ogbomo and R.K.A. Egharevba    

Abstract: The use of some of vegetable oils (rubber seed oil, palm oil and palm kernel oil) was evaluated against cowpea weevil, Callosobruchus maculatus in three cowpea varieties (Ife white, Ife brown and Kano white). The trial involved exposing adult weevils to various levels of 0, 2.5, 5.0, 7.5 and 10.0 mL kg-1 of the oil admixed with cowpea seeds. All studies were undertaken under laboratory temperature of 28±3°C and 70±3% r.h. The results showed that all the plant oils tested have toxic effect on weevils in all cowpea varieties. The oil treatments showed significantly high (p<0.001) mortality of adult weevils (72-100%) at 10 Days after Treatment (DAT). Mean percentage adult weevils mortality in the treated grain (82.5%) was significantly higher than in the untreated control (0%). The treated grains gave adequate protection by recording lower oviposition (10.3%) than the untreated control (96.3%). Lower adult weevils’ emergence (6.3%) was also associated with the treated grains as against untreated grains (88.2%). The plant oil treatments also significantly (p<0.001) reduced weight loss (2.1%) and grain damaged (9.1%) as compared with untreated control of (48.2%) and (93.2%) in weight loss and grain damaged, respectively. There was no adverse effect of the oils on grains quality. Of the three plant oils used, rubber seed oil was the most effective. Among the varieties used in this study, Ife brown was more resistant to cowpea weevil infestation than Ife white and Kano white in that order.

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