Description:

• Cool, moist conditions and cloudy weather are favourable for the occurrence of this disease.

Damage Symptoms:

• Yellow angular spots, confined by veins, can be observed on the upper surface of the leaf.
• A greyish-purple mould can be seen on the lower surface of the leaf.
• Defoliation occurs as the leaves gradually turn brown and dry.
• Leaf damage results in decreased photosynthesis, ultimately affecting plant growth and yield.

Preventive Measures:

• Maintain proper spacing between plants.
• Avoid overhead irrigation.

Control Measures:

• Apply metalaxyl or mancozeb.