Abstract: Mediterranean Fruit Fly (MFF), Ceratitis capitata and Peach Fruit Fly (PFF), Bactrocera zonata are the main insect pests in Egypt and because the monitoring process is done by sex attractant traps that is specialize for males only, while food baits extend to attract both male and female flies and thus, it can be used in monitoring fruit flies, especially female flies. Responding both MFF and PFF to food baits in field trials were studied as aim to evaluate the attraction to some protein derivatives; Cera Trap, Buminal and Bio Nal, in comparison with torula yeast, also effect of pH degree. Results indicated that the highest attractive material for MFF was Buminal bait, followed by Cera Trap and Bio Nal. While, the highest attractive material for PFF was Cera Trap bait, followed by Buminal and Bio Nal. Significant differences in attraction were obtained among different food baits, also between females and males attraction for both MFF and PFF. Number of captured flies for both species was related to pH degree. A significant negative correlation was obtained between concentrations of different food baits in pH degree. A significant negative correlation was obtained for Buminal baits in pH degree with elapsed time while non-significant negative and non-significant positive correlation were obtained for Cera Trap and Bio Nal baits in pH degree with elapsed time.