Powdery mildew is a serious disease of mango in the world caused by a fungus Oidium mangiferee. Young tissues of all parts of the inflorescence, leaves and attacked by the fungus. Crop losses up to 100 percent have been reported in oasis of blossom infection when disease spreads in epidemic form. Conidia are dispersed by wind and germinate best at 20.25°C with moderate humidity. Pathogen survive from one seauch to the next as mycelia in dormant buds and as haustoria en old infected leaves. Telemorph of the fungus. have not been reported in Pakistan or from the other mango growing regions of the world. No completely resistant cultivar of mango has been reported any where but they vary in their susceptibility to powdery mildew. Fungicides applied at 30-40 Percent flowering stage followed by two applications at 2-3 week intervals depending upon environmental conditions can effectively control the malady.