(a) Not over 0.5 percent mixture (distinctly off-type plants) will be allowed on first inspection. No more than 0.25 percent mixture shall be allowed on second inspection. All rogued plants and fruits shall be removed immediately from the fields.

(b) Fields showing more than 0.10 percent of bacterial canker or bacterial fruit spot will be rejected. Fields showing streak, Fusarium wilt or Verticillium wilt will be disqualified if any one or a combination of these diseases is present to such an extent as to mask or make impossible the recognition of other diseases which may be present. Any field showing more than 10 percent of the foliage affected by Septoria blight or more than five percent of the fruit affected by potato late blight or buckeye rot (Phytophthora footrot) at any one inspection shall be rejected. The presence of an unusally large number of weak plants, the cause of which might be a diseased condition, shall disqualify a field. No infection with bacterial wilt (Pseudomonas solanacearum) nor potato ring rot (Corynebacterium sepedoneium) will be permitted.