The effect of three plants aqueous extracts on feed intake and reproduction parameters of Coelaenomenodera lameensis Berti and Mariau (Coleoptera: Chrysomelidae) the pest of oil palm (Elaeis guineensis Jacq.) 

Coelaenomenodera lameensis is an insect and the major pest of the oil palm. Several methods have been employed in the fight against this pest like spraying insecticide on the palm leaflets, systemic insecticide injection in the trunk and biological control using ants of genus Oecophylla. Investigations were carried out at the agro-industrial unit of Toumanguié located in south-eastern Côte d’Ivoire. Aqueous extracts of Ricinus communis (castor oil plant) seed capsule, Azadirachta indica (neem tree) seed and Zingiber officinale (ginger) rhizome were applied in various concentrations on C. lameensis. Leaflets covered with sleeves of muslin were used as substrate for laying and feed intakeby C. lameensis. Two cases were considered. In the first case, the adults were placed on treated leaflets; in the second, the unit (insects and leaflets) were treated. Significant reduction rates of studied parameters, compared to controls, were obtained in second case with R. communis (0.8 g/ml) and A. indica (1.66.10 -3 g/ml). Those were respectively 63 and 60% for the length of furrows, 76.31 and 77.78% for the number of laid eggs, 40.32 and 28.24% for the fertility of eggs, 15.24 and 8.33% for the emergence of adults.The aqueous extract of A. indica and R. communis could be used for integrated pest management against C. lameensis by reducing numbers of its eggs and adults.