Sage Essential Oil Composition from Kabylia (Algeria) and Its Biological Effects Against Cowpea Weevil (Callosobruchus maculatus) (Coleoptera: Bruchidae)

The essential oil extracted from sage leaves and stems by steam extraction was analyzed by CGMS. The results obtained indicate high α thuyone (24.27%), monoterpenes (66.66%), and sesquiterpenes (19.04%) contents. This essential oil was tested on the eggs of Callosobruchus maculatus (Coleoptera: Bruchidae), a stored foods pest, with different doses: 4, 8, 12 and 16 μl/L of air.The hatching rate of eggs, the average number of eggs evolved into larvae, and the average number of emergences were estimated by analysis of variance. The study showed that sage essential oil had an impact on the evaluated parameters. Indeed, in the control lots, 97. 25% ± 2.5 of the eggs hatched, while 96.75% ± 1.25 evolved into larvae. The number of emergence is 96.5% ± 1.72, while the batches treated at the 16 μl/L dose of essential oil air, yielded the following results respectively: 33.5 ± 4.123; 24 ± 2,38 and 19,5 ± 3,109. These results are promising for the development of a bioinsecticide based on sage essential oil.