Industry watchers are quick to point out that no explicit proof has been provided that confirms the disease’s existence on the mid-Wales farm of John Morgan.
Plant health inspectors are conducting tests but these are unlikely to bear results for four to six weeks.
The bacterial disease can seriously hit yields. Outbreaks in the US led to losses of 50%.
Media reports estimate the cost of the potential outbreak to Morgan could be as high as £400,000 with the destruction of 1,500 tonnes of seed potatoes.