Effects of non-lethal attacks by three phytoseiid species on subsequent development, fecundity and mortality of the two-spotted spider mite

The effects of attack by the three predaceous mite species Phytoseiulus persimilis Athias-Henriot, Phytoseius finitimus Ribaga and Amblyseius gossipi Elbadry on the development, reproduction and mortality of the two-spotted spider mite Tetranychus urticae Koch were evaluated after the prey larvae being exposed to attack by these predators for limited periods. Development of the surviving prey immatures was significantly prolonged; this influence was more distinctive when prey larvae were exposed to the predators for a longer period. The number of prey adults which died early was positively correlated with the length of the feeding period allowed to the predators. A substantial reduction in the number of eggs deposited by the prey females was noted, although the oviposition by the prey females was noted, although the oviposition period and adult longevity were not significantly affected.