Cupped, distorted and upright leaves showing the
confluent scabby lesions along veins and petioles (J. O'Sullivan).
raised corky lesions on leaf (E. T. Rasco).
first evident symptoms are small yellowish to reddish
brown spots on the leaves. As the disease advances, spots become corky
outgrowth. Lesions merge and the whole affected tissue develops a
leaf veins are mostly infected. Affected portions
stop growing, so the leaves curl and become contorted or twisted.
lesions on stems may be circular, elongate or flat, depressed or
slightly raised and brownish. Sometimes the borders are distinctly
water-soaked. The lesions become rough and scab-like and can also coalesce
to form larger lesions.
young shoots become contorted and twisted. Badly affected plant
parts dry out and die.
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