Impact of certain materials againist thrips tabaci lind. (thysanoptera: thripidae) in onion fields in Qalyubia governorate.

To reduce the numbers of thrips and comparison using some chemical pesticides and other non-chemical materials, field studies were carried out to assaying the effectiveness of those materials against nymphs and adults of Thrips tabaci on onion in the Qalyubia governorate during 2014/2015 and 2015/2016 seasons. The results showed that chemical insecticide (Radiant 12%) gave high reductions being 95.1% and 89.5% during the first season while, these were 87.1 and 81.6% during the second season for nymphs and adults of onion thrips, respectively. On the other hand, chemical insecticides Lannate 90, Mospilan and some non-chemical materials such as Garlic and Parsley oil and Chinafill 100 showed intermediate effects against nymphs and adults. The insect growth inhibitor (Admiral) showed a weak impact on nymphs and adults of onion thrips as 14.9& 14.3% for 1^st season and 45& 34.9% in the second one for adults and nymphs, respectively. In all cases, the difference between the percentages of reduction for Radiant 12% and Lannate 90 was non-significant during the first season of study while, there was a clear significant difference between both Radiant 12% and the other tested compounds during the second season. Also, the obtained results show that, there were no significant differences between reductions by the remaining tested compounds.