The Netherlands is the world's leader in exportation of seed potatoes. That region, northwestern Europe, has had potato wart since the 1900s. They've been managing the disease through identification of pest-free areas—as has been done similarly in P.E.I.—and other management techniques, including resistant varieties, etc.
It's something that's been there for a long time, and they continue to export potatoes around the world. The number one way to mitigate it is through visual observations.