|Maris peer tubers showing common scab|
Common scab (Streptomyces scabies) is a disease of potatoes, but may also affect beetroot, radish, swede and turnips. It has has very little affect on storability and edibility, but makes the tubers appear unsightly. It is most severe on light soils under dry conditions.
Disease is only skin deep. Lesions may be circular or angular and may coalesce into large irregular areas. Severity can range from sparse colourless, corky lenticels to dark brown, raised or pitted scabs covering the tuber surface.
Common scab might easily be confused with powdery scab. However, powdery scabs tend to have a more round character and when coalescing they tend to merge as discrete eruptions rather than one large scab.
- Potato scabs. The Royal Horticultural Society. Retrieved: 2010-08-02.
- Hessayon, D.G. (2009). The Vegetable & Herb Expert. Transworld Publishers, London. p. 85. ISBN 9780903505468
- (2002). Common Scab. Potato Council. Retrieved: 2010-07-30
- Two_Sheds. (2010). Potato scab. The Grapevine. Retrieved: 2010-07-30.