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Abstract
This study was carried out in two parts; 1) study the feeding habits and 2) the predatory behavior in indigenous species of phytoseiid mites to evaluate their role in biological control. Part I: Feeding habits of predatory phytoseiid mites used in biological control; three phytoseiid mites were selected for our study which have not been studied before; Euseius finlandicus (Oudemans), Typhlodromus balanites El- Badry and Typhlodromus rhenanus (Oudemans) in addition to recognize their feeding on various kinds of pests selected for the current study. Euseius finlandicus, was able to develop and reproduce the best when fed on active stages of eriophyid mite species Aceria olivi, Aceria dioscoridis and Cisaberaptus kenyae. Pollen grains, T. urticae and P. ziziphus eggs were also considered as supplementary food. 100% mortality was recorded when the predator fed on E. orientalis, C. pulcher, T. tabaci, B. tabaci and E. ficus. Total egg production was highest when the predator fed on A. olivi and A. dioscoridis. No mortality was recorded on immature stages of the predatory mite, T. balanites when fed active stages of tested eriophyid mite species compared to 100% mortality when fed on tetranychid, tenuipalpid mites, pollen grains, thrips, whitefly and scale insects. The eriophyid mite A. dioscoridis, recorded the highest reproductive rate ( = 0.212) compared with feeding on other tested eriophyid species.