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Abstract
Pollinators and natural enemies provide good ecosystem service. Bees are well known pollinators though alarm declining has been reporting due to globalization, changes in landscape and modern agronomic practices. Adult of hover flies are efficient pollinator next to bees and larvae of different species has diverse habitat such as many are predators of sucking pest, some are scavenger, mycophagy and some live on heavily polluted water like rattled maggots. The diverse habitat made hover fly less affected by urbanization and modern agriculture. However some factors like barriers in landscape affected on dispersal and migration. The adult of hover flies use phonological traits of flower and population of prey as cues to forage and oviposition. The aphidophagouslarvae provide effective control of aphid and under high population 70-100 % control can be achieved. The larvae are sometime misidentified as pest due to similarity with caterpillars. Body color of larva is opaque with dorsal yellow line. Some species were reported to be eaten up to 1200 aphids during larval stages. Therefore syrphid are important bioagents, pollinators and bio-indicators.