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

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

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19 Pink eye. Tuber rot from severe pink eye infection. 20. Common scab. Streptomyces scabies infection <strong>of</strong> tubers<br />

ranging from surface russeting to deep lesions.<br />

21. Deep common scab. Streptomyces scabies infection with<br />

sparse gray sporulation on the lesion surface. (Courtesy J. E.<br />

Huguelet)<br />

COLOR PLATES<br />

23. Powdery scab. Spongospora<br />

subtorranea infection <strong>of</strong> potato roots.<br />

(Courtesy E. R. French)<br />

IN<br />

/ 22. Powdery scab. Early and late infection <strong>of</strong> tuber. (Courtesy C.<br />

9H. Lawrence and A. R. McKenzie)

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