• Initially small necrotic spots appear on the leaves, and these gradually increase in and form characteristic lesions with dark and light brown concentric ring with a wavy purple margin.
• As infection progresses, the lesions coalesce and cause blighting of leaves
• The disease is mostly confined to older leaves in adult plants, but may infect new leaves of young plants, particularly in the post rainy-season .

Management

• Spray Mancozeb 1kg/ha