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