1. Seed Potatoes
   1. ANY and ALL seed stocks entered for certification must be approved by Montana State University prior to planting.
   2. All potatoes must meet the requirements of this section and meet the disease tolerances in Section 10.
   3. Post-harvest testing (PHT) is mandatory for all seed potatoes. Exemption: Nuclear not to be sold. Dormant tuber (PCR) or sprout testing (ELISA) results for PVY can be used as a supplement to the field postharvest grow out, or in place of a field grow out if there was a failure at the PHT location, or if a variety historically exhibits poor emergence in the field grow out. 
   4. Any potato seed source not certified by Montana State University must be introduced through MSU, and increased through Montana State University Potato Laboratory or an MSU-approved laboratory. The grower involved shall bear all costs.
   5. A seed stock or lot shall be rejected for certification for any of the following reasons:
      1. failure to plant MSU-approved seed;
      2. field(s) or any portion thereof, planted with culls;
      3. blending seed of two different sources;
      4. at the time of inspection or testing, potato plants failed to meet disease tolerance limits in Section 10.
   6. Seed potatoes grown in Montana which have been transported out of Montana cannot be brought back in Montana for recertification.
2. Fields
   1. The detected presence of the pathogen Columbia Root Knot Nematode (Meloidogyne chitwoodi) shall disqualify a field for future production of certified seed potatoes, unless the field(s) is fumigated with a recommended fumigant and rotated to a non-susceptible host crop for five years, or until soil tests indicate absence of Root Knot Nematode.
   2. The confirmed diagnosis of Bacterial Ring Rot shall disqualify from use all fields where bacterial ring rot was found from seed potato production for a period of two (2) years.
   3. There shall be a physical separation:
      1. between one registration and another;
      2. of at least twenty (20) feet between certified potato fields and commercial potato fields.
   4. Fields can be combined into one lot for registration purposes if the primary field is >15 acres and the secondary field is <5 acres and is planted with the same parent lot. 
   5. Certification shall be denied for any seed stocks grown in field(s) where commercial potatoes were grown the previous season.
   6. It is the grower’s responsibility to ensure all farm and non-farm personnel entering seed potatoes fields follow the best practices for sanitation.
3. Storage Facilities
   1. Certified seed potatoes shall be neither stored or graded in a storage facility containing non-certified potatoes.
   2. Crops subject to separate applications for certification may be stored in the same storage facility. A physical identification (i.e. Matting, ribbons, paint, etc.) between registrations for a common variety is permissible as long as seed potatoes from the transition zone are identified as a mix between the two lots for tracking purposes. However, if stored together without a demonstrable separation and a disqualifying disease is found, all commonly-stored seed will be denied certification.
   3. It is the grower’s responsibility to sanitize the potato storage facility.
4. Equipment
   1. It is the grower’s responsibility to sterilize the equipment before and after use.
   2. The exchange of equipment with neighbors is discouraged. Any such exchanges WILL CONFORM to the conditions in Section 2.G.