How do I control downy mildew and powdery mildew differently in grapes (angoor)?

Downy mildew and powdery mildew are different diseases that need different timing and chemistry, so identify them correctly first. Downy mildew thrives in wet humid conditions and shows oily yellow patches on the upper leaf with a white downy growth on the underside, spreading fast after rain or heavy dew. Powdery mildew prefers warm dry conditions with high humidity and shows a white powdery coating on leaves, shoots, and berries, scarring the fruit. Manage both with an open well-pruned canopy, good air movement, and a planned fungicide programme that rotates modes of action to prevent resistance, while strictly following label rates and the residue limits that matter for export grapes. For the current spray schedule and approved products, follow your grape research station advisory and KVK.