spots caused by P. ipomoea-batatas (E. Rasco).
to black pin-head structures (pycnidia) at centre of lesions (E.
older leaves have whitish to tan brown lesions surrounded by dark
purple to brown margin, with irregular shape and measure 5-10 mm
wide. Centre of mature lesions have few pinhead-like black to brown
structures clearly visible to naked eye.
lesions can coalesce and cover a great portion of the leaf.
lesions are more prominent on the upper surface of leaves.
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