Symptoms

• Cracks appearing in leaf spot
• The two species of Alternaria occur commonly, causing the characteristic leaf spots with concentric rings.
• The spots are mostly irregular, 4-8 mm in diameter and may coalesce to cover large areas of the leaf blade.
• Severely affected leaves may drop off.
• A. melongenae also infects the fruits causing large deep-seated spots.
• The infected fruits turn yellow and drop off prematurely.

Management

• Spray mancozeb @ 2 g/l
• Spraying 1 per cent Bordeaux mixture or 2 g Copper oxychloride or 2.5 g Zineb per litre of water effectively controls leaf spots.