1)Powdery mildew: Patchy, white powdery growth appears on upper surface of leaves also on main stem of infected plant. It parasitizes the plant using it as a food source. In severe infestation it causes defoliation and premature fruit ripening.
If infestation is observed take spray of water soluble Sulphur@20gm/10Ltr of water 2-3 times with interval of 10 days.
2)Downy mildew: Caused by Pseudopernospora cubensis. Symptoms are mottling and purplish color spots are seen on lower surface of the leaves.
If infestation is observed, 400gm Dithane M-45 or Dithane Z-78 is used to get rid of this disease.
3)Anthracnose: Anthracnose affected foliage appears scorched appearance.
As a preventive measure, treat seed with Carbendazim@2gm/kg of seed. If infestation is observed in field, take spray of Mancozeb@2gm or Carbendazim@3gm/liter of water.
4)Wilt: Root rotting is a result of this disease.
If infestation is observed then drenching with M-45@400gm mixed 100ltr of water is done.