うどんこ病
Powdery mildews are generally host-specific, and powdery mildew of grape is caused by a host-specific pathogen named "Uncinula necator". Powdery mildew is a polycylic disease that thrives in warm, moist environments. Its symptoms are widely recognizable and include gray-white fungal growth on the surface of infected plants. A sulfur formulation, fungicides, and limiting the environmental factors that favor the growth of powdery mildews are all practices that can stall and/or halt its growth.