الفهرس 
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Abstract
Fruit trees in Ismailia Governorate are affected by many mite pests. The study was conducted to study survey mites associated with fruit trees. Studies were carried out between October 2014 and September 2016. During the present study, the inspection of the surveyed fruit trees showed the occurrence of 44 mite species belonging to 36 genera and 21 families belong to 2 orders and 4 mite suborders. order Acariformes include three suborders; Prostigmata, Astigmata and Cryptostigmata. order Parasitiformes include one suborder; Mesostigmata. The collected mites were classified according to their feeding habits to phytophagous, predaceous and whose food is uncertain. Population density of mites associated with some fruit trees was carried out in the experimental farm of Faculty of Agriculture during two seasons. Control studies were carried out to evaluate the effect of Ulva lactuca extraction on phytophagous mites after 24, 48 and 72 hrs. of treatment. Data showed that after 24 hrs of treatments petroleum ether extracted was the most effective at the LC50 level followed by ethyl acetate (27.9 and 43.72 for E. orientalis and 21.33 and 35.62 for O. mangiferous, respectively). Also, effects of acaricides on the adult female of phytophagous mites, E. orientalis and O. mangiferous were studied. Based on the LC50 values, hexythiazox was the most effective acaricides against E. orientalis and O. mangiferous (LC50 8.7 and 5.9 mg/L, respectively), followed by abamectin (LC50 7.2 and 9.3 mg/L) then bifenzate (LC50 9.6 and 11.8 mg/L, respectively). Data showed that O. mangiferous was highly susceptible than E. orientalis based on LC50 values. Phytoseiulus macropilis developed to adult stage when feed on immature stage of Eutetranychus orientalis and Olignychus mangiferous under laboratory condition at 25±2°C and 65±5% relative humidity with 16:8 L:D hr. photoperiodic regime.