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Compendium of Potato Diseases - (PDF, 101 mb) - USAID

Compendium of Potato Diseases - (PDF, 101 mb) - USAID

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40. Rhizoctonia black scurf. Sclerotia <strong>of</strong> R. solani on 41. Rhizoctonia canker. R. solani infection <strong>of</strong><br />

tuber surface. underground stems, sclerotia on seed tuber, and<br />

aboveground perfect stage (white area) on larger central<br />

stem. (Courtesy R. Zachmann)<br />

42. Silver scurf. Helminthospsorium solani infection <strong>of</strong> tuber.<br />

(Courtesy J. E. Huguelet)<br />

COLOR PLATES<br />

43. Black dot. Colletotrichum atramentarium<br />

on stem. (Courtesy E. R.<br />

French)

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