For the facts on any rootstock seeds, I usually go to the producer's website. Last year when I was looking at a few options, I found conflicting info on certain resistances among the re-sellers, even the reputable ones.
The RST rootstock are from DP seeds -
http://dpseeds.com/shop/rootstock/rs...ato-rootstock/
The DRO141TX rootstock I used is from De Ruiter Seeds -
https://www.deruiterseeds.com/en-us/rootstock.html
Here's the latest table of what's available from vegetablegrafting.org, but I've found even the table doesn't always have the same information that you'll find on the producer's website -
http://www.vegetablegrafting.org/res...otstock-table/