In some situations, you can simply remove the scab and the potatoes can still be eaten. This variety was popular in the 1970`s for its high yield and even sized, marketable tubers. Common Scab is a very common disease of potatoes and is widespread throughout the country and is naturally present in most soils. It can also affect beetroot, radish, swedes and turnip. Potatoes, beetroot, radishes, carrots, turnips, swedes and a range of weed species. It does not affect the taste of the potato, and is easily removed on peeling. Potato scab is a common disease amongst tubers. Normally scab does not affect the yield but the skin becomes ugly and you might have to peel your potatoes thickly. Powdery scab became prominent in the UK when the highly susceptible variety Pentland Crown was widely cultivated. It lives in the soil free and attacks the potatoes in ideal conditions. In worst instances, however, they will make the potato unattractive, and hence, they are not suitable for farmerâs markets. Berkshire, United Kingdom . Deep cracking and pits develop in severe cases. Scab can be worse in dry weather, so keep potatoes well watered. Although powdery potato scab looks similar to common scab, itâs caused by a slime mould, Spongospora subterranea, rather than a bacterium. Serious bacterial potato disease, otherwise referred to as bacterial wilt, which is not established in the UK. The main source of the disease is infected soil. Potato scab is a common disease and it is caused by a bacteria Streptomyces scabies. Potato Scab - Is it okay to eat potatoes that have scab? It is the raised wart like scabby growth not powdery. Common potato disease, normally noticable on tubers but affects the entire plant. Potato scab: This disease causes raised scab-like lesions on the potato surface. Skin-blemishing potato disease which although has no effect on cooking quality, can greatly affects a cropâs market value. 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. The same bacteria attacks radish, beetroot, turnip and swede too. Dry Rot Again in contrast to common scab, powdery scab is most common in wet seasons and on heavy, poorly drained soils. Common Scab. Once established it continued to survive and flourish on succeeding susceptible varieties. Brown Rot. The scab organism may be found living in the soil on most farms even in the absence of potatoes â¦ I wrote the article below for Garden News a few weeks back and I have certainly had a few phone calls since then. All my potatoes have it (only a bucket full but still!). 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). Before writing it I did consult with the Chemist at Everris as well as with Dr David S 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. Identification and Management of potato diseases Symptoms. Development. Shallow and irregular blemishes on the tuber, occasionally with a raised appearance. 20 Aug, 2011; Featured on: potatoes Severe attacks are most likely to occur on light, sandy, alkaline soils with a low organic matter content and in â¦ Remedy: There is no control for scab, and you usually wonât know anything is wrong until harvest time.