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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.
Nutrients and Micronutrients. If your potato plants turn light green or yellow while the leaf veins remain green, or if they take on a scorched appearance, the soil may be deficient in nutrients. The most common deficiencies when growing potatoes are magnesium and sulfur.Iron and manganese, both micronutrients, are essential for potatoes as well.f your potato plants turn light green or yellow while the leaf veins remain green, or if they take on a scorched appearance, the soil may be deficient in nutrients. The most common deficiencies when growing potatoes are magnesium and sulfur.