Bordeaux mixture applied at fungicidal rates will work. New shoots may die if severely deficient. Apply chelated iron, dried blood, manure, or sewage sludge. Few flowers or fruit. Very slow growth of plants, followed by progressive pale green color moving from tip and young leaves back to more mature leaves.
Leaves are small, thin, perhaps with purple veins.
Stems eventually brown and dry off. Flower buds yellow and drop. Apply N immediately. Slow growth, purple tinged small leaves that feel fibrous. Fruit set delayed.