Potato Ring Rot


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Potato Ring Rot

 

a bacterial disease that affects the vascular tissue of potatoes.

The causative agent is Corynebacterium sepedonicum. The leaves of diseased plants turn yellow and wilt; if the infection is severe, the entire plant dies. When the tubers are cut, creamy yellow rings of affected vascular tissue, which later turn black, are visible in the early stages of the disease; there is also a yellowish mucoid mass of bacteria. Potato ring rot progresses while the potatoes are in storage. Another form of the disease— yellow pitted rot—arises as a result of the infection of healthy tubers while they are being harvested and manifests itself in March and April. Small round depressions with decayed, yellowed flesh appear on the tubers. Control measures consist in selecting healthy planting material, planting potatoes in whole tubers, cultivating resistant varieties, and carrying out general agrotechnical measures for improving the condition of plants.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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Graham Nichols, vice-chairman of NFU Horticulture, representing potatoes, said: "While this outbreak of potato ring rot is of great concern, it must be remembered that this is a one-off outbreak that has been caused by the use of imported seed.
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That is the advice of the British Potato Council following the discovery of potato ring rot - a disease hitherto unknown in Britain - on a Welsh farm and three others in the South-West of England.
What is potato ring rot? It is a bacterial disease found mainly in North America and northern Europe.
Disease status: Potato ring rot is a serious disease that is listed in EC plant health legislation and results in host farms or companies facing quarantine restrictions.
Welsh Minister Don Touhig said potato ring rot detected on Middlewood Farm, Bwlch probably arrived in seed imported from the Netherlands last year.
UK Welsh Minister Don Touhig told MPs the potato ring rot detected on a Welsh farm is believed to have been found on potatoes grown from seed imported from Holland last year.
But the Assembly said it was doing all it could to minimise the damage already caused by potato ring rot.
The discovery of potato ring rot in seed supplies at John Morgan's farm, near Brecon, means he will be unable to work his land for up to four years.