International Journal of Academic Multidisciplinary Research (IJAMR)   Year: 2019 | Volume: 3 | Issue: 9 | Page No.: 13-20 Studies on the Effect of Some Botanical and Petroleum Oils For the Control of Onion Thrips (Thrips Tabaci Lind.; Thysanoptera: Thripidae) And Onion Yield Wessal Y. H .A, Hassan O. K. , Ammar M.S. Abdalla Abstract: Two field experiments were carried out in two successive seasons in two sites in Gezira State. The experiments aimed at studying the efficacy of some botanical oils including sesame, cotton, groundnut, sunflower and petroleum oil on thrips, Thrips tabaci (Lind.) population compared to the standard commercial insecticide Karate 5% EC (lambda-cyhalothrin)..The results indicated that all oil treatments were apparently very effective against the onion thrips compared to the untreated control. Significant differences in the number of insects were encountered on onion plant in both sites in season 2006/07. However, during season 2007/08 highly significant differences were found in the onion thrips population in both sites. Sesame oil was found to be more effective in controlling the pest followed by groundnut oil, petroleum oil, cotton oil and sunflower oil, respectively. The oil treatments decreased thrips population within 2-7days. The yield data showed highly significant differences between treatments in the two testing seasons with exception to site two in 2007/08 season. However, a remarkable yield increase was recorded from Karate treatment throughout the course of the study and in both seasons. Generally, the control treatment scored the lowest yield throughout the test period which explains the importance of the pest damage if left unchecked.