TZ, sorry to read about the garden difficulties, I suffer similar troubles every year but I spread my risks with 10 or more locations each year.
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I have a 2n Skagit Valley Gold cross with long runners so there were a lot of exposed tubers = a small dishshpan of green tubers.
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Good news....Skagit Valley Gold was bred and increased annualy with late blight as a control. It is fairly tolerant to LB and the tubers also...not just the foliage.
Yes, the spores can/may overwinter and that is why i do the most breeding work in those areas for both tomatoes and potatoes. I have yet to explore my tomatoes for ripe fruits in the worst areas this season, as I am too busy extracting from blemish free tomato patches.
Drying out the tubers and watching them should be enough for your green tubers. I plant them the next year as long as they are sound...and since they should be resistant/tolerarant...go ahead and plan to replant the tubers.