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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.
Brown leaf spot in potatoes: Plan for this early blight look-alike in 2013. Brown leaf spot of potatoes can be misidentified as early blight, potentially compromising disease control. Early blight, caused by Alternaria solani, is a very common fungal disease present in most regions that produce potatoes.