The Globe and Mail reports in its Thursday, Sept. 29, edition that one of Canada's largest medical marijuana producers, which raised concerns with Health Canada over harmful chemicals found in cannabis sold at Vancouver dispensaries, sought permission to use a controversial fungicide on its own crops last year, but says it later abandoned the idea. The Globe's Grant Robertson writes that according to the British Columbia Lobbyists Registry, Tilray asked for British Columbia's support in getting federal approval to use Nova 40W, a fungicide that contains myclobutanil -- a chemical effective at controlling crop diseases, but one that has been at the centre of controversy. It is banned by several U.S. states for use on cannabis because of concerns it emits hydrogen cyanide when heated. Tilray said it sought to use the product in the belief that it was being employed by non-licensed marijuana grow operations to control a fungal disease known as powdery mildew. Tilray did not say how it knew the product was being used by those operations, but spokesman Zack Hutson said the bid was halted after Health Canada subsequently issued a list of alternative fungicides that the company now uses.