The new test uses advanced DNA technology and aims to prevent spread of the disease into the UK. The automated test is the result of a three-year Sustainable Arable Link project with BPC support and can detect the level of brown rot bacterium in sewage, potato washings and irrigation water. The new test is so sensitive it can detect the disease even in the presence of millions of other bacteria and compounds found in washings, for example.

'The bacterium that causes the disease has previously been found in British watercourses, possible entering via effluents containing industrial potato washings or via domestic sewage,' said Ewen Brierley, the BPC's research and development manager. 'The research has also demonstrated that the bacterium, if found in washings or sewage can be eradicated from these sources.' The project was funded by Defra and Seerad and was led by the Central Science Laboratory with collaboration from Adas Consulting, the Potato Processor's Association, UK Water Industry Research, Greenvale AP, Wm Morrison Supermarkets, McCain Foods (GB) and three waste treatment companies.

Dr Brierley pointed out that brown rot is one of the most damaging potato diseases world-wide and has quarantine status in Europe. 'UK potatoes are brown rot free and we want to ensure they remain that way by monitoring our water, particularly in areas where potato crops are irrigated,' he said.

Levy-payers can access a fact sheet on monitoring and controlling brown rot at www.potato.org.uk or by calling 01865 782270.

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