Section R. 285.628.5a - Nuclear, foundation-field year 1 through 5 and certified field year 1 through 6 seed lots; certification requirementsRule 5a. Seed lots of nuclear, foundation-field year 1 through 5 and certified seed shall not be certified as such if any of the following provisions apply:
(a) Less than all of the potato acreage on the farm producing such lots was planted with seed that had been certified.(b) The following visual field inspection or laboratory testing tolerances for diseases and varietal mix are exceeded during any field inspections or laboratory observations: | FOUNDATION CLASS | | CERTIFIED CLASS |
| NUCLEAR/FY-1 | FY-2THROUGHFY-5 | | | FY-1THROUGHFY-6 |
| Leaf roll | 0.00% | 0.25% | | Leaf roll | 0.50% |
| Mosaics | 0.00% | 0.25% | | Mosaics | 1.00% |
| Spindle tuber | 0.00% | 0.00% | | Spindle tuber | 0.00% |
| Aggregate | 0.00% | 0.25% | | Aggregate | 1.00% |
| B.R.R. | 0.00% | 0.00% | | B.R.R. | 0.00% |
| Varietal mix | 0.00% | 0.10% | | Varietal mix | 0.25% |
* Any varietal mixture in nuclear or foundation-field year 1 stock shall be rogued to achieve 0 (zero) tolerance.
(c) Roguing is not completed before the second inspection.(d) The tuber samples that are winter-tested exceed the disease inspection tolerances for virus leaf roll, rugose mosaic, potato virus Y, and spindle tuber, which shall be an aggregate of 0.5 for foundation-field year 1 through foundation-field year 5, and 5.0% for certified field year 1 through certified field year 6.Mich. Admin. Code R. 285.628.5a