grapevine fanleaf degeneration disease on a grape leaf, which is caused by the grapevine fanleaf virus

agriculture background branch caused closeup degeneration disease fanleaf fertilizer food fruit fungi fungicide garden gardening gflv grape grapes grapevine green growing growth hand hazardous horticulture infection infectious leaf malformations mildew mold mosaic mottling natural nature organic pathogen pattern plant powdery season spray spread strain stunted summer syndromes vine vines vineyard virus which yellow