Among 357 diseased flocks (372807 birds) aspergillosis was recorded in 35 (37275 birds) indicating an overall prevalence of 9.8 per cent. Prevalence of aspergillosis varied in various age groups, seasons of the year, in birds fed on different feeds and kept under different managemental conditions. From all the postive samples only Aspergillus fumigatus was isolated from lungs (100%), dead in shells (87%), air sacs (68%), peritoneum (37%), feed (90%) and litter (71%). Sabouraud's dextrose agar was found to be the best media for isolation studies. Among 179 isolates 156 were highly sensitive to copper sulphate, 154 to gentian violet and 150 to propionic acid.