Title: Evaluation of the biological effects of leaf extracts of Jatropha curcas against Sitophilus zeamais (Coleoptera: Curculionidae).
Abstract: This study assessed the grain protectant potentials of leaf extracts of Jatropha curcas. Its effects on inhibition of oviposition as well as F1 progeny production by S. zeamis on grains pre-treated with graded doses of the plant extracts were examined. The results obtained showed that the extract significantly inhibited oviposition in a dose dependent manner. About 26.62% and 76.49% inhibition of oviposition were obtained for the lowest (5% w/v) and highest (100% w/v) concentrations of the extract tested repsetcively. The same trend was observed for F1 progeny production with suppression of 10.88% and 77.69% obtained for 5% w/v and 100% w/v respectively. The study further examined the insecticidal and antifeedant effects of the plant extract. Results obtained showed that a dose-dependent insectidical and antifeedant effects were observed. The lowest incidence of insect mortality and higher number of grain damage were observed in grains pre-treated with the lowest of plant extract while the highest incidence of insect mortality and lowest grain damage was observed in grains pre-treated with the highest concentration (100% w/v) of plant extract. Future work will examine the potentials of other extracts of J. curcas.
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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Cited By Count: 3
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