- Brown corky arcs and spots in tuber flesh, rarely
visible on skin surface. Spraing infected tubers usually produce
healthy plants but some may have several healthy stems and one
stunted stem with symptoms, i.e. stem mottle. Yellowish mottle on
leaves not stems, sometimes finely etched yellow rings and lines or
brown arcs and V shaped markings, leaf margins often distorted or
constricted. A few tubers from stem mottle plants may contain small
spots, less frequently arcs.
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