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Cause of Potato Scab. The cause of common potato scab is a bacterium, Streptomyces Scabies, found in the soil. It is most common on light, sandy soils, low in organic matter. Soils that were previously grassland are particularly liable to having the disease. Soils with a high pH (recently limed) provide a better environment for the bacteria.
Cause of, Identification of, Prevention of and Control of Potato Powdery Scab. Powdery scab is quite similar to common potato scab at first glance except that the scabs are more circular with a darker appearance giving a definite raised ring. These erupt, liberating pale brown spore masses and leaving loose skin edges to the lesions. In bad cases the tubers will be deformed by the disease.