closeup of vine grape leaf affected by downy mildew plasmopara vitikola

affected agriculture antifungal close closeup conditions contagious damage disease downy fertilizer fungal fungi fungicide fungus garden gardening grape green growing hand industry infected infection injuring injury insecticides killing leaf leaves mildew mold nature outdoors pathogen plant plasmopara spores spots spray spread summer symptoms uncinula vegetable vine vineyard viticulture vitikola weathers wine