Field experiments (from December 2012 to December 2013) were carried out to study the population density, the optimum trap height and optimum time for trapping the peach fruit fly (PFF), Bactrocera zonata and Mediterranean fruit fly (MFF), Ceratitis capitata in Guava orchards at Nubaria district, Beheira Governorate, Egypt, using Jackson traps provided with the sex attractants Methyl eugenol (for PFF) and trimedlure (for MFF). Generally, Males of B. zonata were caught in higher number than C. capitata and the difference between the two flies was statistically high significant. The traps were hung at the height of 1, 2, 3 and 4 meter from ground level and the captured males were weekly recoded. It was noted that significantly highest number of males of B. zonata were captured in the trap hung at 3 m height and the highest number of males of C. capitata was recorded at 4 m height. Also, the results revealed that the significantly highest number of male flies of B. zonata (1.02 ± 0.11 males /trap /hour) and C. capitata (0.59 ± 0.07 males /trap /hour) were recorded during the period from 7.00 -10.00 am.