07/14/2026
RELEASE: Mushrooms Canada Responds to Preliminary U.S. Antidumping Determination
July 14, 2026- Harriston, Ontario — Mushrooms Canada today responded to the U.S. Department of Commerce’s preliminary antidumping (AD) duty determination in the trade case concerning fresh mushrooms from Canada.
Commerce’s preliminary antidumping rates are significantly lower than the 32% to 44% margins alleged by the American Petitioner Giorgio. Commerce determined that the preliminary “all-others” AD rate is just 8.26 percent.
“Today’s preliminary determination confirms that the petitioner’s original dumping allegations were overstated,” said Ryan Koeslag, Executive Vice-President & CEO of Mushrooms Canada. “Commerce’s preliminary rates are far below the levels alleged by Giorgio at the start of this case.”
Mushrooms Canada emphasized that Commerce’s preliminary antidumping finding reflects the idiosyncrasies of U.S. antidumping law, rather than the commercial reality of the North American mushroom market.
“U.S. antidumping law contains technical calculation rules that can produce a finding of ‘dumping’ even when business sense and market realities tell a different story,” Mr. Koeslag said. “A straightforward comparison of true average U.S. prices to true average Canadian prices would show no dumping at all. The preliminary rate announced today is the product of legal methodology — not proof that Canadian growers are selling unfairly.”
The trade case is far from over. Commerce must still issue final AD and CVD determinations, and the U.S. International Trade Commission (USITC) must make a final injury determination. If the USITC finds that imports of fresh mushrooms from Canada are not causing material injury or threat of material injury to the U.S. industry, any AD/CVD duties will be terminated.
“Mushrooms Canada will continue to participate fully in the process and demonstrate that the allegations against our sector are unfounded,” Mr. Koeslag said. “Canadian growers provide high-quality, responsibly produced mushrooms that support consumers, retailers, foodservice operators, and the broader North American market.”
Mushrooms Canada also noted the deep integration of the Canadian and U.S. mushroom industries.
“The mushroom sector in North America has grown through collaboration, cross-border supply relationships, and shared commitment to quality and food security,” Mr. Koeslag said. “This case should not obscure the fact that Canadian and U.S. producers, workers, customers, and consumers all benefit when our markets remain connected and reliable.”
About Mushrooms Canada
Mushrooms Canada is the national trade association representing Canadian mushroom growers, processors, and industry partners. For more than 70 years, the association has promoted food safety, sustainability, innovation, and the responsible growth of Canada’s mushroom sector.
Media Contact: Ryan Koeslag Executive Vice-President & CEO Mushrooms Canada Email: [email protected] | 519-897-9088
