Results of the present study indicated that Tunisian C. aurantium essential oils have insecticidal property against adults of B.tabaci, which could mainly attributed to monoterpenoids, compounds that possess insecticidal activity against a range of insect species. Indeed, the higher insecticidal capacity of better orange oil could be linked to the presence of limonene. This most abundant component in bitter orange essential oils has been proved to be toxic against several insect species and reported the insecticidal activity of d-limonene against Rhyzoperta domonica Fab., Sitophilusoryzae L. and Tribolum castaneum Herbst