Efficiency of Some Chemical and Bio-Insecticides Against Onion Thrips, Thrips Tabaci Lindeman (Thysanoptera: Thripidae)

Onion thrips, Thrips tabaci (Thysanoptera: Thripidae) is one of the main problems and yields limiting factors in onion fields (Allium cepa L.). In present work, an effort was made to study relative susceptibility different cultivars infestation with evaluation some chemical bio-insecticides against T. effect meteorological on its population density. The results showed that infest all tested more or less, however cultivar Red Giza be most tolerant among other cultivars. 6 susceptible followed by Beheri, 20 finally White Giza. However, there were no significant cultivars.The insecticides can arranged according their efficacyagainst nymphs descending order as follows; spinetoram, pyridalyl,imidacloprid, thiamethoxam, lambda-cyhalothrin, dinotefuran, pyriproxyfen, malathion, azadirachtin Beauvaria bassiana. On hand, these general means reduction percentages adults a pyridalyl, imidacloprid, bassiana azadirachtin.The trends revealed thrips had two generations during growing period. There significantly negative correlation (P˂0.05) between density humidity. also temperature positively affect both seasons2020 2021.