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Russeting, raised corky areas, and small pits on the skin of potato tubers are all signs of scab disease, which is caused by bacterialike organisms. A severe case of potato scab may ruin the crop, but mild cases are more common and infection is primarily a cosmetic issue. Other root crops, such as parsnips, beets, carrots and turnips are also vulnerable to scab. The organisms that cause scab are stimulated by soils that have a high organic matter content.
Last updated: 10/24/15
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