The effects of three botanical oils on management of onion thrips, Thrips tabaci (Lind) (Thysanoptera: Thripidae) and some ecological aspects, Gezira state, Sudan

Onion thrips (Thrips tabaci (Lindeman) is the most serious insect pest causing damage to crop. This study aimed evaluate effects of some botanical oils including cotton, castor bean and bitter cucumber on infesting onion. Field experiments were conducted at Gezira state during two winter seasons (2015/16-2016/17). Two in first season (2015/16) experimental farm University Research Station Farm (GRSF) Agricultural Corporation (ARC). The third experiment was second (2016/17) for confirmatory studies (ARC) observation plot 20 X 40 m2 used population dynamics natural enemies. design randomized complete block (RCBD) with four replications. Cotton oil, oil applied a concentration 2.5% (2015/16). In 50% upper lower concentrations rates (1.25%, 3.75%). onion variety Saggai. results indicated that all treatments effective against compared untreated control. Significant differences p< 0.01 mean number insects found. show reducing other oils, as well control treatment. A large enemies thrip found (ARC), while, Orius bug jumping spider available by end these had role decreasing thrips. No significant difference observed between yield. recommends crude 1.25% can be reduce