USDA Revises the Mushroom Grade Standards

USDA Revises the Mushroom Grade Standards dparker Tue, 08/25/2026 - 11:54 Date August 25, 2026 The U.S. Department of Agriculture’s (USDA) Agricultural Marketing Service (AMS) is revising the United States Standards for Grades of Mushrooms, at the industry’s request, to align with current marketing trends and provide industry with uniformity when marketing mushrooms. AMS is amending the standards to (1) add a grade for portabella mushrooms, (2) remove size from the criteria for each grade and create a separate section for size, (3) revise the tolerances for defects – consistent with modern pro