Insecticidal properties and persistence of Berlinia grandifolia (J. Vahl) and Securidaca longepedunculata Fres., two Aromatic Plants from the Far-North region of Cameroon alone or in Combination against Sitophilus oryzae L. (Coleoptera : Curculionidae).
Journal Title: International Journal of Farming and Allied Sciences - Year 2015, Vol 4, Issue 8
Abstract
The aim of the present work was to evaluate the insecticidal effects of two plants used by farmers as natural pesticide to manage stored sorghum pests in the Far-North Region of Cameroon. Dried powders of Berlinia grandifolia (trunk bark) and Securidaca longepedunculata (root bark) were tested against Sitophilus oryzae. Powders were tested at 0.05, 0.5, 1, and 2 g/100 g of sorghum grain for screening LD50 and LT50 on adults’ mortality of each plant. Combinations of plant powder toxicity and persistence were evaluated with screening results data’s on adults’ weevils toxicity. Results showed that the effects varied with plant species, quantity and exposure time. Securidaca longepedunculata plant powder is the most toxic (LD50 = 0.07g/100g grain) and have rapid effects (LT50 = 3.72 days at 1 g/100 grain) than Berlinia grandifolia (LD50 = 2.046g/100g of grain; LT50 = 7.82 days at 1 g/100g of grain). The toxicity of Berlinia grandifolia on adults decreased of 33.87 % from 7 to 19 days post treatment. There was not decrease observed in Securidaca longepedunculata mortality rate in the same conditions (69.975 ± 3.072 % of mortality mean). The mortality rates induced by combinations of the powders (Securidaca longepedunculata + Berlinia grandifolia) were increased by the proportion of Securidaca longepedunculata used, and, after 3 to 7 days exposure time, a synergic effect was observed. These results suggest that a suitable strategy for pest management of stored sorghum is possible by using natural product.
Authors and Affiliations
Kouninki Habiba, Matakone Romain-Rolland, Nukenine Nchiwan Elias
Keywords
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