We have always battled potato scab. Some years I have had better luck than others. I read online that if you grow your potatoes from seed, rather than last year’s tuber, they will not pass on diseases. In addition, if the seed is grown in your own garden, it will be more adapted to your climate.
Last year my potatoes had blossoms and set seed. I decided to try an experiment with them. In February I planted the tiny seeds, using many more than I wanted because I did not know what their germination rate would be. Of course they all sprouted.

Haines Arpt., AK