Common Scab is a very common disease of potatoes and is widespread throughout the country and is naturally present in most soils. Powdery scab became prominent in the UK when the highly susceptible variety Pentland Crown was widely cultivated. Scab can be worse in dry weather, so keep potatoes well watered. It is the raised wart like scabby growth not powdery. Before writing it I did consult with the Chemist at Everris as well as with Dr David S Potatoes, beetroot, radishes, carrots, turnips, swedes and a range of weed species. Common scab mainly affects potato (Solanum tuberosum), but can also cause disease on radish (Raphanus sativus), parsnip (Pastinaca sativa), beet (Beta vulgaris), and carrot (Daucus carota). Remedy: There is no control for scab, and you usually won’t know anything is wrong until harvest time. Shallow and irregular blemishes on the tuber, occasionally with a raised appearance. Common potato disease, normally noticable on tubers but affects the entire plant. The scab organism may be found living in the soil on most farms even in the absence of potatoes … Berkshire, United Kingdom . It lives in the soil free and attacks the potatoes in ideal conditions. POTATO SCAB AND ITS CONTROL Common scab is caused by a miscroscopic fungus or mold that lives in the soil and infects potatoes, certain other vegetables, and probably several weeds. It does not affect the taste of the potato, and is easily removed on peeling. Potato scab is a common disease amongst tubers. Deep cracking and pits develop in severe cases. 20 Aug, 2011; Featured on: potatoes Common Scab. This variety was popular in the 1970`s for its high yield and even sized, marketable tubers. Although powdery potato scab looks similar to common scab, it’s caused by a slime mould, Spongospora subterranea, rather than a bacterium. It can also affect beetroot, radish, swedes and turnip. All my potatoes have it (only a bucket full but still!). Again in contrast to common scab, powdery scab is most common in wet seasons and on heavy, poorly drained soils. Serious bacterial potato disease, otherwise referred to as bacterial wilt, which is not established in the UK. Once established it continued to survive and flourish on succeeding susceptible varieties. I wrote the article below for Garden News a few weeks back and I have certainly had a few phone calls since then. Development. Common scab is a plant disease of root and tuber crops caused by a small number of Streptomyces species, specifically S. scabies, S. acidiscabies, S. turgidiscabies and others. Brown Rot. Identification and Management of potato diseases Dry Rot Skin-blemishing potato disease which although has no effect on cooking quality, can greatly affects a crop’s market value. The same bacteria attacks radish, beetroot, turnip and swede too. Potato scab is a common disease and it is caused by a bacteria Streptomyces scabies. Symptoms. 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