What raspberries are resistant to Phyto root rot?

[atash]

Supposedly Rubus coreanus is, which does not seem to be in cultivation in the USA anyway. I know the native R. spectabilis is--but the fruit also happens to be insipid. Might make a good cross if I could find a compatible species, as it makes a nice shrub, not just a cane like most Rubus.

I'm guessing the native R. leucodermis is not which might explain why I do not see it in the lowlands. When I tried growing one from seed, it whithered and died just like every other Raspberry does in my yard.

What about Japanese Wineberry? Those are supposed to be good to eat--and vigorous to the point of being weedy. Anyone know if they resist Phytophthora root rot? (no idea which species but I'm sure we have every one known to mankind).

Much obliged.

[castanea]

I don't know any that are, but the Korean raspbery is available from GRIN.

[atash]

Thanks, Castanea. Maybe I should just try a variety of wild species and see how they perform. My reading is leading me in circles. A lot of breeding programs have put out papers discussing how they have used various species to transfer resistance to root rots, but I have never seen any of these hypothetical hybrids.

I was curious as to how local commercial growers can grow them at all; well I should have guessed; they grow exclusively primocane varieties, hill them up, and spray fungicides.