• Scab lesions appear on all parts of the vine that are above ground.
• The first symptoms appear as light water soaked or pale green spots on the leaves.
• These spots are numerous and appear on and between veins. Similar elongated spots develop on petioles and stems.
• Gradually, the spots turn grey to white and become angular.
• The affected leaves near the tip of the vine may be stippled with dead and yellowish spots, stunted and crinkled.
• Fruits are infected at all stages of growth but is most susceptible while young. Fruit spots are grey, slightly sunken and about 2.0mm in dia.

Management

• Crop rotation with corn once in 4 years.
• Grow resistant varieties like Highmoor and Maine no.2.
• Spray Mancozeb 0.2 %.