Why have my potatoes produced a scabby growth on the tubers?
Posted by Dobies Staff on 28 October 2014 11:18 am

The fungal disease powdery scab is fairly common and widespread especially where the potatoes are grown on heavy, clay soils and in wet seasons.

Powdery Scab has more rounded pustules than common scab and when they erupt give off a fine powder of spores. A ‘cankerous’ form can occur in susceptible varieties producing outgrowths on the tuber, the tops of which can be slimy. The spores may survive in the soil for 3 years or more.

The only remedy is crop rotation leaving at least 3 years before replanting in the same area, as attacks are more likely to occur where potatoes are grown in the same place year after year. Grow the potatoes in a well-drained soil. Infected tubers must not be added to the compost bin.

The varieties Desiree, Gemson and King Edward show some resistance to this disease.

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