Laboratory studies were directed to clarify the efficacy of Solar oil E.C., CAPL-2 and Jojoba oil E.C. on newly hatched larvae of P.gossypiella susceptible and Cyanox-resistant strains. Results show that Solar and CAPL-2 gave the highest effect and that susceptible strain was more affected than the resistant one. Moreover, field experiments were carried out during 1997 & 1998 cotton seasons on cotton at Sharkia governorate to evaluate the performance of some natural oils for controlling cotton bollworms, i.e. Solar oil E.C., CAPL-2, and plant oil Jojoba E.C. These oils were sprayed in biweekly schedule during two successive seasons. Two and three sprays were applied in 1997 and 1998, respectively. Results obtained show that the second and third spray gave the highest insecticidal effi­ciency, as it was applied during the appearance of a new generation. So­lar oil gave the highest reduction in population followed by CAPL-2 and Jojoba oil E.C.