Corky Scab is caused by bacteria Streptomyces scabies. It is
particularly severe in dry periods. Affected potato tubers get scab
lesions, which are quite variable, giving a raised corky area, or a pit.
*To control corky scab:*
* Keep potatoes well watered, especially during tuber set
* Aim for a soil pH of 5 or 5.2, by using acid producing
fertilisers, such as ammonium sulphate. Do not lime or add manure
before potatoes
* Grow resistant varieties
* Buy scab-free seed
* Rotate crops and have at least 4 clear years between potato crops
on the same soil
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[...] healthy, but they went through a very dry period, and some of the tubers have suffered from corky scab. In spite of this, they have yielded a substantial 2 kilos from one root. These Maris Bard potatoes [...]
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