WTO notification · TBT
United StatesUpdated: check whether it is now adopted or in force
Official title
Revising U.S. Standards for Grades of Mushrooms
The United States issued an addendum on 26 August 2026 to the earlier TBT notification G/TBT/N/USA/2270. Addenda often report that a measure was adopted, changed, postponed or withdrawn. The measure was first notified on 13 April 2026. The comment period closed on 9 June 2026.
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Mushrooms and truffles:; Quality in general; Quality management and quality assurance; Vegetables and derived products
The comment period closed on 9 June 2026. You can still raise concerns about the measure with your country's WTO TBT enquiry point, quoting the document symbol G/TBT/N/USA/2270/Add.1; it can take them up with the United States.
Find your country's enquiry point on WTO ePing (opens in a new tab)Latest notice (G/TBT/N/USA/2270/Add.1, 26 August 2026)
Revising U.S. Standards for Grades of Mushrooms
The Agricultural Marketing Service (AMS) of the Department of Agriculture (USDA) is revising the U.S. Standards for Grades of Mushrooms to add a grade for portabella mushrooms, remove size from the criteria for each grade and create a separate section for size, and revise the tolerances for defects consistent with modern production and handling practices. In addition, AMS is updating terminology, definitions, and defect scoring guides throughout the grade standards. These changes align the grade standards with modern harvesting practices and provide guidance for the effective utilization of this commodity. Applicable 24 September 2026. 91 Federal Register (FR) 54845, 25 August 2026: This final notice and the notice notified as G/TBT/N/USA/2270 are identified by Docket Number AMS-SC-25-0056. The Docket Folder is available from Regulations.gov at and provides access to primary documents as well as comments received. Documents are also accessible from Regulations.gov by searching the Docket Number.
Notice and request for comments - The Agricultural Marketing Service (AMS) of the Department of Agriculture (USDA) proposes to revise the U.S. Standards for Grades of Mushrooms. The proposed changes would add a grade for portabella mushrooms, remove size from the criteria for each grade and create a separate section for size, and revise the tolerances for defects, consistent with modern production and handling practices. In addition, AMS proposes to update terminology, definitions, and defect scoring guides. Copies of the current U.S. Standards for Grades of Mushrooms are available at
Every notice about this measure published here, newest first. Each one is the notifying member's own text.
AddendumG/TBT/N/USA/2270/Add.1
Revising U.S. Standards for Grades of Mushrooms
The Agricultural Marketing Service (AMS) of the Department of Agriculture (USDA) is revising the U.S. Standards for Grades of Mushrooms to add a grade for portabella mushrooms, remove size from the criteria for each grade and create a separate section for size, and revise the tolerances for defects consistent with modern production and handling practices. In addition, AMS is updating terminology, definitions, and defect scoring guides throughout the grade standards. These changes align the grade standards with modern harvesting practices and provide guidance for the effective utilization of this commodity. Applicable 24 September 2026. 91 Federal Register (FR) 54845, 25 August 2026: This final notice and the notice notified as G/TBT/N/USA/2270 are identified by Docket Number AMS-SC-25-0056. The Docket Folder is available from Regulations.gov at and provides access to primary documents as well as comments received. Documents are also accessible from Regulations.gov by searching the Docket Number.
Regular notificationG/TBT/N/USA/2270
Comment deadline: Closed on 9 June 2026
Revising U.S. Standards for Grades of Mushrooms
Notice and request for comments - The Agricultural Marketing Service (AMS) of the Department of Agriculture (USDA) proposes to revise the U.S. Standards for Grades of Mushrooms. The proposed changes would add a grade for portabella mushrooms, remove size from the criteria for each grade and create a separate section for size, and revise the tolerances for defects, consistent with modern production and handling practices. In addition, AMS proposes to update terminology, definitions, and defect scoring guides. Copies of the current U.S. Standards for Grades of Mushrooms are available at
Expodite writes its summary from the official record. The notification and the documents it notifies are on the WTO's own websites.
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