Neal asked: "Interesting, Margie. I wonder if resistance to the mites has anything to do with it?"
I looked into it a little more and this is what I found.
https://www.preprints.org/manu...
After reading the following link, I had two questions 1) I wonder what's in the parentage of Stormy Weather (cl Orard 2010) that makes it resistant?
http://www.rosebreeders.org/fo...
And 2) - "could Stormy Weather as a rootstock protect against a new infection even though it could not protect against a massive concentration of virus in an established infection." The same question someone else on the forum asked.
I decided to look into the parentage: Heart 'n' Soul' and 'Rhapsody in Blue. I thought to myself if SW is resistant there must be others. I came across this thread, the post by mike_rivers(z5 MI) is most informative (it's about 1/3 down the page) :
http://forums.gardenweb.com/di...
This link has a chart "Table 2"
http://neilsperry.com/wp-conte...
What stood out to me in Table 2 was Rosa californica - I remember Porkpal acquiring this recently.
Getting back to the parentage of SW : Heart n Soul x Rhapsody in Blue.
Rhapsody in Blue parentage is:
Seed: Summer Wine (climber, Kordes 1985)
Pollen: International Herald Tribune × [[Blue Moon × Montezuma (grandiflora, Swim, 1955)] × [Violacea × Montezuma (grandiflora, Swim, 1955)]]
Here's a chart I made of International Herald Tribune - notice the yellow stars.
Numerous people are working on RRD:
http://www.newplantsandflowers...
http://americanhort.theknowled...
