| canada | | potato witches'-broom phytoplasma | species | 7 | 0 |
| china | | potato witches'-broom phytoplasma | species | 2 | 0 |
| south korea | | potato witches'-broom phytoplasma | species | 3 | 0 |
| united states | | potato witches'-broom phytoplasma | species | 4 | 0 |
| united states | alaska | potato witches'-broom phytoplasma | species | 1 | 0 |