mildew and oidium. bunches of white grapes affected by powdery mildew or oidium with rotting berries. rotten grapes affected by a

agriculture background branch disease diseased downy false fertilizer food fresh freshness fruit fungal fungicide fungus garden grape grapevine green growing harvest hazardous infection leaf mildew mold mushroom natural nature oidium organic outdoors pathogen plant powdery rotten sick spore spot spray spread summer vine vinery vineyard viticulture white wine