The insecticidal effect of vegetable Oils of two plants in the Far North Region Cameroon was
evaluated on the adult population of Anopheles gambiae s.l. in Maroua through of net bed in the
laboratory. The plant oils of Azadirachta indica and Khaya senegalensis were extracted from mature
seeds, then diluted with petroleum ether. Plots of net bed were impregnated with these solutions.
After 24 hours of exposure, the plant oil extracts showed a repellent effect on insecticide in adult A.
gambiae. A. indica provided an LC50 of 2.77g/m², and K. senegalensis an LC50 of 2.79g/m². For
lethal 50 hours (HL50), A. indica provided 11 hours 56 mins 42 seconds of HL50 and K. senegalensis
gave 14 h51mn19s. As cons, the Mosquito Impregnated Net has an LC50 of 2.30 × 10-4
g/m2
and an
HL50 of 2 hours 52 min 28seconds. Vegetable oil of A. indica presented quite high toxicity compared
to that of K. senegalensis in A. gambiae. However, these two vegetable oils have a lower toxicity
than the deltamethrin usually used for to the concentration of 5.5 × 10-4
g/m
2
insecticide effect.