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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.
Sometimes potatoes develop a green tinge-a potato exposed to light, sprouted or unsprouted, may itself have an increased concentration of glycoalkaloids. If this is the case, the toxic area will turn green. You can cut the green part off and eat the rest of the potato.When buying potatoes, pick firm ones and do not buy if they have sprouted or have a green tint to the skin. As for storing, keep potatoes in a cool dry spot for longest storage.f this is the case, the toxic area will turn green. You can cut the green part off and eat the rest of the potato. When buying potatoes, pick firm ones and do not buy if they have sprouted or have a green tint to the skin.