Potato spraing

Symptoms

- 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.