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.