Abstract
Abundance and fluctuation of Tetranychus urticae Koch, Aphis gossypii Glover and Bemisia tabaci (Gann.) were studied on three eggplant cultivars (i.e. Baladi-White, Florida Market and Baladi-Black) during 2009 and 2010 successive seasons. T. urticae occurrence continued almost all the season and reached its maximum at the end of June or the beginning of July. A gossypii reaching the highest abundance in the middle of September while B. tabaci reached its maximum abundance at the end of July and first half of August. Variance in susceptibility among tested cultivars was recorded based on the abundance averages overall the two seasons. Florida Market, Baladi-White and Baladi-Black recorded the lowest abundance of T. urticae, A gossypii and B. tabaci, respectively. Phytoseiulus persimilis proved to be a good biocontrol agent against T. urticae at release ratios of 1 :5 and 1:10 predator : prey. A reduction appeared one week after release, generally it revealed 68.60 and 88.20 % mean reduction for both release ratios, respectively.
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