Powdery Mildew

White or greyish powdery coating on leaves, shoots and buds. Leaves gradually yellow, curl and drop. Most intense in hot, dry weather.

Spray with fungicides (Topaz, Score, Fundazol) or copper-soap solution (5g copper sulfate + 50g soap per 10L water). Baking soda spray (1 tbsp per 1L water). Remove affected parts. Prevention: avoid overcrowding, limit excess nitrogen.