The Dutch Plant Protection Service warned of a possible problem with seed potatoes exported to the UK from a Dutch farm at which an outbreak had been detected.
FERA's Plant Health and Seeds Inspectorate has been tracing stocks and testing them at its laboratory in Sand Hutton, North Yorkshire, which have indicated that ring rot is present in one of the varieties - though final confirmation will take several more weeks.
Tracing of stocks of other varieties grown on the farm which grew seed potatoes from the Dutch stocks is also under way, as well as tracing of ware potatoes grown from the Dutch stocks.
FERA said in a statement: "While the industry as a whole is not considered to be at risk, if growers are concerned they can speak to their local Plant Health and Seeds Inspector"
"Information about ring rot and its symptoms is available in a factsheet [pdf]."
FERA has not disclosed details of the UK farms or the potato varieties involved.