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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.
That green under the skin is a result of chlorophyll. Chlorophyll is the substance that makes all plants green but that chemical is not the one that is dangerous. When the chlorophyll is synthesized in the potato plant there are other reactions that are the ones that cause problems.reen Potatoes. Green potatoes are not a new type of potato. Any potato can turn green and is not exactly a good thing. Potatoes are one of the most popular vegetables in the world.