Mungbean (Vigna radiata L.) is routinely grown in the experimental fields at headquarters of World Vegetable Center (23°6'30.88N, 120°17'51.31E) for breeding, research and germplasm multiplication. In a spring 2016 mungbean trial, about 50% plants were affected with powdery mildew. The white, powdery-like patches first appeared on upper leaf surfaces, soon developed to grey both sides leaves. P...