The studies on seasonal incidence of mango fruit-fly indicated that pest was appeared in April to June. The influence of ecological factors, viz., biotic (host plant) and abiotic factors (weather parameters)on the abundance and population of fruit fly. Bactrocera dorsalis on mango were worked out. Peakincidence of fruit fly activity was observed during last week of May (6 to 9 infected fruits 20 fruits).However, a gradual increase was observed during first week of April (24 infested fruits/20 fruits)anddeclined during fourth week of June (5.7 infected fruits/20 fruits). Correlation studies betweenincidence and weather parameters showed significant positive relationship with maximum andminimum temperatures and negatively correlated with rainfall and relative humidity (morning andevening). Older mango trees (15 and above years old) were more susceptible to fruit fly damagethan young trees.