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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.
Potato and tomato blight, properly called late blight, is a disease of the foliage and fruit or tubers of tomatoes and potatoes, causing rotting. It is most common in wet weather.