The production of maple products, including maple syrup, sugar and butter in Canada represents approximately $360 million to the Canadian economy (Anon., 2013). Of this total, approximately 10% is from rural Ontario. Almost all of the production can be described as artisanal, i.e., small producers on their sugar maple woodlots. It has long been known that some fungi can grow on packaged maple syrup that has not been sufficiently heated before sealing (Heald and Pool, 1908 and Whalen and Morselli, 1984) or stored for a long time after opening. The common wisdom has been that moldy maple syrup “unless severely damaged” can be filtered, re-heated and blended and packaged (Perkins and van den Berg, 2009). While this advice reflects common sense, there is little information on the consequences of the mold growth. Whalen and Morselli (1984)