The discovery of 80 blighted potatoes among last autumn's crop is threatening economic ruin on Canada's "Spud Island." The red soil of Prince Edward Island produces around 30% of the nation's potatoes, however since inspectors noted the cases of the potato wart fungus a trade quarrel has erupted between Canada and the US, who implemented a temporary ban on potato imports last October that has slashed shipments from the Canadian province by 50%.