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2017 | 70 | 2 | 86-96
Article title

Bio-insecticidal activity of Delonix regia oil extracts on maize weevil Sitophilus zeamais (Motschulsky, 1855) (Coleoptera: Curculionidae)

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The maize weevil, Sitophilus zeamais (Coleoptera: Curculionidae) is one of the major pest infesting stored grains world wide. Experiments were conducted to study the efficacies of D. regia oils on mortality and adult emergence of S. zeamais Motschulsky. The long time storage and viability of the treated maize grains were also investigated. Results obtained showed that D. regia oil at every concentration was lethal on S. zeamais. At 1.0%, 1.5%, and 2.0% concentration, there was 100% mortality of S. zeamais at 96 h of exposure. The least potent extract was 0.5% concentration. The extracts drastically reduced adult emergence to 0.0% in grains treated with 1.5% and 2.0% oil extracts concentration. Grains treated with 1.0%, 1.5% and 2.0% D. regia seed oil completely prevented infestation and subsequence damage of the treated maize grains for a period of three Months. Thereafter, 20.04% damage was observed in grains treated with 0.5% oil extract. The oil extracts at all concentrations in this experiment hardly affected germination as there was no significant difference between percentage germination in the treated grains and the control. The results obtained reveal that oil extracts of D, regia seeds are effective in controlling S. zeamais and could serve as alternative to the controversial convectional chemical insecticides
Physical description
  • Department of Plant Science and Biotechnology, Plant Resources Management Programme, Ekiti State University, P.M.B 5363, Ado Ekiti, Nigeria
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