الفهرس 
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Abstract
The laboratory experiments in this study was carried out in the laboratory of Cotton Bollworms Research Department, Protection Research Institute, Sharkia Branch, Zagazig, Agriculture Research Center to evaluate the toxicological, biological and histopathological effects of XenTari, Biovar, Jojoba oil, NeemAzal, orange oil and Dursban (O.P. Insecticide) on the pink bollworm, Pectinophora gossypiella (Saund.) and cotton leafworm, Spodoptera littoralis (Boisd.). The field experiments were carried out at Zagazig District to evaluate the effect of previous compounds on reduction percentages of the pink bollworm larvae and cotton leafworm larvae in cotton fields. Results clear that all compounds had toxic effect on the 2nd instar and 4th larvae of S. littoralis and newly hatched larvae of P. gossypiella. Increasing the concentration of compounds and days post-treatment caused increase in larval mortality percentages. Jojoba oil had the highest mortality percentage on S. littoralis (33, 42, 46, 47and 50%) and (41, 49, 53, 45 and 57%) after 1, 3, 5, 7 and 10 days from treatment by recommended and double recommended concentration as compared with 5% for control after 10 days. While the lowest mortality percentages were (13, 16, 18, 20 and 21%) and (19, 25, 28, 31 and 32%) recorded with Orange oil, respectively. 2nd instar larvae were affected more than 4nd instar larvae. While, Azadirachtin had the highest mortality percentage on P. gossypiella larvae followed by Biovar, XenTari, Jojoba oil and Orange oil. These compounds showed the different effects on some histopathological and biological aspects of S. littoralis treated as 2nd and 4th instar larvae and pink bollworm treated as newly hatched larvae, caused decrease in larval & pupal mortality percentage, larval & pupal weight, pupation & adult emergency percentage, deposited eggs/ female and hatchability percentages as compared with control. While, Dursban showed the highest effects on these biological aspects as compared with previous compounds. On the other hand, these compounds caused reduction of the pink bollworm larvae and cotton leafworm larvae in cotton fields. Biovar caused the highest seasonal reduction percentages in the number of P. gossypiella larvae (50.55%) followed by XenTari (45.80%) Orange oil (45.50%), Azadirachtin (39.71%) and Jojoba oil (26.83%) as compared with 66.25% for Dorsban. Jojoba oil caused the highest seasonal reduction percentages in the number of S. littoralis larvae (44.82%) followed by XenTari (43.82%) Azadirachtin (40.54%), Biovar (38.33%) and Orange oil (38.26%) as compared with 86.43% for Dorsban.