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Mushrooms Grades and Standards

What follows are the grading notes from the USDA for mushrooms.

Grades of Mushrooms

  1. S. No. 1consists of fresh mushrooms of similar varietal characteristics which are mature, at least fairly well shaped, well trimmed, free from open veils, disease, spots, insect injury, and decay, and from damage by any cause.
  2. Size. Size is specified in terms of diameter and unless otherwise specified meets the requirements of one of the following size classifications:
  3. Small to medium — up to 1-5/8 inches in diameter;
  4. Large — over 1-5/8 inches in diameter.
  5. Tolerances. In order to allow for variations incident to proper grading and handling the following tolerances, by weight, are provided as specified:
  6. At shipping point.2 5 percent for mushrooms in any lot which fail to meet the requirements of this grade, but not more than one-fifth of this amount or 1 percent shall be allowed for mushrooms affected by disease, spots, or decay.
  7. En route or at destination. 10 percent for mushrooms in any lot which have open veils. 5 percent for mushrooms in any lot which fail to meet the remaining requirements of this grade, but not more than one-fifth of this latter amount or 1 percent shall be allowed for mushrooms affected by disease, spots, or decay.
  8. For off-size. Ten percent for mushrooms in any lot which fail to meet the specified size requirements.
  9. S. No. 2. The requirements for this grade are the same as for U.S. No. 1 except for a greater tolerance for open veils and a larger tolerance for defects.
  10. Size. Size is specified in terms of diameter and unless otherwise specified meets the requirements of one of the following size classifications:
  11. Small to medium — up to 1-5/8 inches in diameter;
  12. Large — over 1-5/8 inches in diameter.
  13. Tolerances. In order to allow for variations incident to proper grading and handling the following tolerances, by weight, are provided as specified:
  14. (1) At shipping point.2 Ten percent for mushrooms in any lot which have open veils. Ten percent for mushrooms in any lot which fail to meet the remaining requirements of this grade, but not more than one-tenth of this latter amount or 1 percent shall be allowed for mushrooms affected by disease, spots, or decay.
  15. En route or at destination. 25 percent for mushrooms in any lot which have open veils. 10 percent for mushrooms in any lot which fail to meet the remaining requirements of this grade, but not more than one-tenth of this latter amount or 1 percent shall be allowed for mushrooms affected by disease, spots, or decay.
  16. For off-size. 10 percent for mushrooms in any lot which fail to meet the specified size requirements.

 

 

Canned Mushrooms Grades and Standards

Grades of Canned Mushrooms

U.S. Grade A is the quality of canned mushrooms that possess similar varietal characteristics; that possess a normal flavor and odor; that possess a good color; that are practically uniform in size and shape, except for the style of stems and pieces; that are practically free from defects; that possess a good character; and that for those factors which are scored in accordance with the scoring system outlined in this subpart the total score is not less than 90 points: Provided, that the canned mushrooms may be fairly uniform in size and shape for the applicable styles if the total score is not less than 90 points.

U.S. Grade B is the quality of canned mushrooms that possess similar varietal characteristics; that possess a normal flavor and odor; that possess a fairly good color; that are fairly uniform in size and shape, except for the style of stems and pieces; that are fairly free from defects; that possess a fairly good character; and that for those factors which are scored in accordance with the scoring system outlined in this subpart the total score is not less that 80 points: Provided, that the canned mushrooms may fail to meet the requirements for U.S. Grade B for the factor of uniformity of size and shape for the applicable styles if the total score is not less than 80 points.

Substandard is the quality of canned mushrooms that fail to meet the requirements of U.S. Grade B.

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