Ah your article shows most of the rootstock coming from Missouri during that blight. I’ll have to double check and find a source where I remember that from.

Edit: I believe my thoughts were because Vitis Vinifera is often grafted onto Vitis californica rootstock. But it looks like it was mostly mix breeds of Vitis rupestris.

Always fun to see more how random animals/plants nearly destroy and are also supporting systems for each other worldwide at this point.