Problems
Grape vines can suffer from powdery mildew in hot, dry weather or when growing in crowded positions with poor air circulation.
They can also suffer from grey mould (Botrytis), downy mildew and the physiological disorder known as shanking. Birds and wasps can be problematic, and it is a good idea to hang wasp traps nearby, especially with early-season grapes.
Vines may suffer from nutrient deficiencies, particularly magnesium deficiency.