Author(s):

Grace Mètomè, Euloge S Adjou, Bertin A Gbaguidi, Edwige Dahouenon-Ahoussi and Dominique Sohounhloue

Abstract: The aim of this study was to evaluate the insecticidal and repellent effects of essential oils extracted from leaves of Cynnamomum zeylanicum and flowerbuds of Syzygium aromaticum against the weevil of pigeon pea (Cajanus cajan L. Millspaugh). Chemical analysis by GC/MS of the essential oil of Cynnamomum zeylanicum led to the identification of 29 components, characterized by E) cinnamaldehyde (37.6%), cinnamyl acetate (23.7%), benzyl benzoate (2.4%), α-pinene (2.7%) and linalool (2.2%) as major components. Chromatography analysis of essential oil from flowerbuds of Syzygium aromaticum enabled the identification of 12 components, characterized by eugenol (91.3%), trans-ß-caryophyllene (4.4%) and eugenyl acetate (2.4%). The results of contact toxicity tests indicated that the from 0.4µl.g^-1the mortality rate of pigeon pea weevil is 100% after 24 hours for the essential oil of Cynnamomum zeylanicum, while it is still at 20% for the essential oil of Syzygium aromaticum. Results also indicated that Cynnamomum zeylanicum oil has a high repellent activity, when compared to the essential oil of Syzygium aromaticum. The essential oil of Cynnamomum zeylanicum, with high insecticidal and repellent properties, offers a novel approach to the management of storage. Developing biocides from these essential oil would be contributive for a lasting solution to the many problems posed by the use of synthetic insecticides.

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