Diseases of fruit plantation medicinal and aromatic crops (2+1)

Leaf spot

Causal organism: Cercospora psidii

• The disease appears as water-soaked, irregular patches which look brown on the lower surface of the leaves.
• Old leaves are mostly infected and the severely affected ones curl and subsequently drop.
• Affected leaves show round or light irregular spots, brownish-red in colour.
• The central portion of the spot turns white. These spots coalesce to form large irregular, white patches surrounded by a brownish margin.
• These leaf spot diseases are checked by spraying with copper oxychloride (0.3 per cent).