The greater American potato industry is closely watching Maine, as seed potato farmers prepare to control a new outbreak of an old disease. The Maine Department of Agriculture, Conservation and Forestry is considering a proposal to set limits on the prevalence of the rotting disease blackleg in its certification of seed potatoes, which more than 100 Maine farmers sell to other farmers along the East Coast. Over the last two years, the Maine Potato Board and some seed potato farms have been dealing with concerned customers — farmers growing certified Maine seed potatoes who suffered outbreaks of blackleg. Some farmers in states such as Maryland and Pennsylvania lost as much as half of their crop to the disease in 2015, said Tim Hobbs, the Maine Potato Board’s director of grower relations. More