Tobacco leaf spot

Ascochyta arida

Small circular to irregularly-shaped spots, beginning small (0.25 in) and expanding as they mature (1.25 in). Lesions are dark brown with yellow halos surrounding the spots . Within the lesions, dark rings may be observed that contain thousands of spores that may be splash- or wind-dispersed to newer leaves. Lesions may coalesce, causing the necrotic tissue to tear away, leaving the leaves ragged. Brown spot can continue to develop under curing conditions, causing moldy growth on cured leaves.

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