- Yellow spots appear on leaves which turn brown and finally turn black on aging.
- They usually start from margins and produce concentric rings.
- Severely affected vines look like burnt charcoal.
- Adopt clean cultivation and crop rotation cultural practices are adopted for prevention of disease.
- Spray Mancozeb 75% WP @ 400 gram/acre or hexaconazole 5% SC @ 300 ml/acre at 10-15 days intervals.
- Spray chlorothalonil 75% WP @ 300 gram/acre at 10 days intervals.
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