| Name | Links | |
|---|---|---|
| Scottish Seed Potato Classification Scheme "The SPCS maintains high standards for seed health and purity and operates by exerting official control over initial propagating material, the length of the multiplication chain, and application of strict tolerances for diseases, including those caused by viruses."... | ||
| Seed Potato Classification Scheme "The Seed Potato Classification Scheme (SPCS) provides classification of all potatoes produced and marketed in England and Wales, depending on the class of the parent seed, and the health of the crop and tubers... |