Plants suffer from a number of fungal,bacterial and viral diseases thereby causing anormous damage in there productivity. Fungal diseases are very important.Pea (Pisum sativum) is a leguminous plant. It provides protein to those who depend mostly on vegetarian food. Hence,pea finds an important position in india as most of the people are vegetarian and also the meat protein is very costly. The producton of pea crop is largely hampered due to several diseases where powdery mildew incited by Erysiphe pisi is the most important one as immune varietes are hardly available in commercial...