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The Genus Bactrocera is very assorted group of Tephritidae family, attacking on several fruits. The Bactrocera dorsalis is one of the complex fruit flies of this diver’s genius, hunting on very delicious fruits such as mango. The purpose of this study is to observe the relationship among the environmental and host effects on the outbreak of this crucial pest. The research work was conducted in two gardens (50 hectors) of mango fields of Mirpur Khas, known as mango land of Sindh during (2014-2015) seasons. The two sites of garden with different varieties of mango were selected and 10 traps hanged in (1hector) trees. Methyl eugenol (volatile chemical) embedded in homemade (plastic bottles) traps with cotton soaked. Traps were changed weakly (1020 replications). Total 14548 fruit flies cached; during mango season; with significant values F=29.6, p< 0.05). The relationship among the population and Abiotic factors during both seasons showed significant relationship with temperature (r=0.587, r=0.81), rainfall (r=0.194, r=0.43), Humidity (r=0.064, r=0.21) and wind velocity (r=0.773, r=0.58), respectively. This relationship of abiotic factors clearly shows that pest emergence increase with peak season of host and ecology of field. This research work indicated about pest alarming occurrence time, correlation of environmental factors and suggesting future pest management strategies for controlling Pest. [ABSTRACT FROM AUTHOR]