1. (1) External defects. External defects in a certified seed potato include the following:

   1. (a) Deep air cracks that penetrate beyond the vascular ring.
   2. (b) Shallow air cracks that materially detract from the appearance of the potato.
   3. (c) Second growth or growth cracks that materially detract from the appearance of the potato.
   4. (d) Brown or dark skin discoloration that materially detracts from the appearance of the potato.
   5. (e) Shriveling, sponginess or flabbiness, except minor shriveling.
   6. (f) A sprout over one inch long.
   7. (g) One or more scabs that together cover more than 5% of the potato surface. Scabs may include pitted scabs.
   8. (h) Pitted scab that causes a loss of more than 5% of the weight of the potato.
   9. (i) Rhizoctonia that materially detracts from the appearance of the potato.

   10. (j) Wireworm or grass damage that includes any of the following:

       1. 1. In a potato that is at approximately 2½ inches wide or weighs approximately 6 ounces, a hole more than ¾ inch long or multiple holes with an aggregate length of more than 1¼ inch.
       2. 2. Proportionately smaller or larger holes in a smaller or larger potato.
   11. (k) A more than slight amount of dirt or foreign matter adhering to the potato, or present in the sample of potatoes.

2. (2) Internal defects. Internal defects in a certified seed potato include the following:

   1. (a) Ingrown sprouts, if removal causes a loss of more than 5% of the weight of the potato.

   2. (b) Internal discoloration, occurring entirely within the vascular ring, which includes any of the following:

      1. 1. In a potato that is at approximately 2½ inches wide or weighs approximately 6 ounces, the equivalent of 3 scattered light brown spots 1/8 inch in diameter.
      2. 2. A proportionately smaller or larger number or size of spots in a smaller or larger potato.
   3. (c) Internal discoloration located or extending outside of the vascular ring, if removal causes a loss of more than 5% of the weight of the potato.

3. (3) Defects constituting serious damage. The following defects constitute serious damage:

   1. (a) Caked dirt covering more than ½ of the potato.
   2. (b) Brown or dark skin discoloration that seriously detracts from the appearance of the potato.
   3. (c) Excessive shriveling, sponginess or flabbiness.
   4. (d) One or more scabs that together cover more than 50% of the potato surface. Scabs may include pitted scabs.
   5. (e) Pitted scab that causes a loss of more than 10% of the weight of the potato.

   6. (f) Wireworm or grass damage that includes any of the following:

      1. 1. In a potato that is at approximately 2½ inches wide or weighs approximately 6 ounces, a hole more than 1¼ inches long or multiple holes with an aggregate length of more than 2 inches.
      2. 2. Proportionately smaller or larger holes in a smaller or larger potato.
   7. (g) Ingrown sprouts, if removal causes a loss of more than 10% of the weight of the potato.

   8. (h) Internal discoloration, occurring entirely within the vascular ring, which includes any of the following:

      1. 1. In a potato that is at approximately 2½ inches wide or weighs approximately 6 ounces, the equivalent of 6 scattered light brown spots 1/8 inch in diameter.
      2. 2. A proportionately smaller or larger number or size of spots in a smaller or larger potato.
   9. (i) Internal discoloration located or extending outside of the vascular ring, if removal causes a loss of more than 10% of the weight of the potato.

History

History: CR 06-085: cr. Register April 2007 No. 616, eff. 5-1-07.