Avoidable loss and management of stem fly, Ophiomyia phaseoli (Tryon) was studied on greengram during 2010-11 at the Agricultural Research Station, Gulbarga. Minimum of two sprays of thiamethoxam 25 WG @ 0.2 g/l was required at 7 and 14 days after emergence (DAE) of the crop to protect the crop. Further four sprays of thiamethoxam 25 WG at 7, 14, 21 and 28 DAE recorded least stem tunneling (5.63%) which was on par with three and two sprays suggesting two sprays at 7 and 14 DAE was sufficient to manage the stem fly. Management of stem fly indicated that seed treatment with thiamethoxam 35 FS @10 ml/kg seed or imidacloprid 60 FS @ 5.0 ml/kg seed recorded least seedling mortality and stem tunneling with highest grain yield (8.90 q/ha) and net returns of ` 14350/ha.