Lack of vine elements Phosphorus deficiency Iron deficiency Manganese deficiency magnesium deficiency Calcium deficiency Potassium deficiency Boron deficiency Zinc deficiency Vine diseases Powdery mildew Black rot Phomopsis Face necrosis ash Bitter rot Sourdough White rot (ripe rot) Grapevine cancer Botrytis (gray mold) Anthracnose Vine pests Chichinobella, deciduous grape worm Mealybug Root auger tick Flea Krazana Japanese beetle, June green beetle Thrips Drosophila Bukna