Essai de lutte contre Oryctes monoceros Olivier (Coleoptera : Dynastidae) par l'utilisation de l'acide 4-méthyloctanoïque en Côte -d'Ivoire

Trial of Oryctes monoceros Olivier (Dynastidae) control by using the 4-methyloctanoic acid in Cote d'Ivoire Oryctes monoceros Olivier is one of the most dangerous pests of young coconuts Cocos nucifera Linne (Arecaceae) in Cote-d'Ivoire. In order to reduce their populations, 4-methyloctanoic acid was initiated. In this work, 3 different types of diffusers (Da, Db, Dc) was tested. The study over nine months covered four phases with one month (without diffusers), four month (with diffusers), two month (diffuser withdrawal) and two month (post diffuser). Coconuts were visited 3 twice in a week by collecting insects of galleries and wrote down climatic characteristics, sex of insects. Diffusers were weighted at the beginning and every month during phase with diffusers. We notice that three types of diffusers have the same effectiveness against O. monoceros attacks, diffuser Dc, characterized by a low concentration, is economically more reasonable and could be recommended to the farmer for the protection of their plantations.