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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.
Dear Sloane, It sounds like your potatoes are burning because of the starch. The starch in potatoes is made up of sugars that, when put in a hot pan, will start to caramelize and maybe even burn before the potato has had the time to cook through. There are two things you can do to prevent this from happening.