Abstract: Suhail, A., M.Razaq and M. S. Yazadni. 2000. Studies on Seasonal Activity and Control of Fruit Flies (Dacus spp.) on Mango (Mangifera indica L.) at Faisalabad, Pakistan. Arab J. Pl. Prot. 18: 121-123. Studies were conducted to investigate efficacy of insecticidal application and pheromone traps against fruit flies on mango. Experiments were laid out in the orchards of University of Agriculture, Faisalabad, Pakistan. Orchards were treated with Diptrex 80 SP (trichlorophon) from May to August, (1997), once a month, along with 2, 4, and 6 pheromone traps/ha. . It was found that 4 pheromone traps were best for controlling fruit flies with minimum damage of 1.5% and 4.15% in July and August respectively. The investigations on seasonal activity showed that population of Dacus zonatus (Saunders) was higher than Dacus dorsalis (Hendel) through out the activity season 1997. Maximum population of males of Dacus spp. was observed in first week of July. Fourteen days interval application was found to be more effective than monthly applications.