http://www.greenhousegrower.com/article/32859/reducing-the-spread-of-r ose-rosette-disease

The site has a provision for comments so it may be worth revisiting.

Every article on RRD mentions the role multiflora wild roses play in spreading the disease--because multiflora is so susceptible.

A lot of us buy roses from Palatine which uses multiflora rootstock for most of its roses.

Does that mean our Palatine roses will be more susceptible to RRD?

Thank you for any information on this issue.

Kate

http://www.gardenatoz.com/what's-up!/tip-cuttings/rose-rosette-disease /

Kate

The next question- wouldn't rose growers (large operations) in highly impacted RRD areas be expected at some point to get the disease? RRD infections can probably happen anywhere along the chain to the garden center-- but I am wondering if it is prudent to consider adding roses from badly infected areas??
Some states have strict AG import rules to stem these kinds of tides.....

One has to wonder whether rootstocks of native American wild roses that have demostrated an effective immune system against rose rosette virus would at least be effective at slowing down the spread of the disease. This could be a stop gap method until crosses with native American wild roses produce immune commercial garden roses.

"Rosa setigera, R. virginiana, and R. palustris and the naturalized R. rugosa seem to be very resistant to possibly immune to the disease."

See:

http://www.mdinvasivesp.org/archived_invaders/archived_invaders_2011_0 7.html

http://hortsci.ashspublications.org/content/47/2/164.short

Somewhere else in the article it was said that RRD has been steadily spreading from west to east, which got it backwards I think. I have heard conflicting information about whether pruners spread RRD. Seems like we're still in the information gathering stage .

http://www.youtube.com/watch?v=SNGBh-l2PHg

"We show that the aphid Rhopalosiphum padi, after acquiring Barley yellow dwarf virus (BYDV) during in vitro feeding, prefers noninfected wheat plants, while noninfective aphids also fed in vitro prefer BYDV-infected plants."

This suggests that it may be possible to infect roses with a weakened form of rose rosette virus whose presence would discourage mites infected with the full blown virus from feeding on the "vaccinated" roses.

I spent another two hours today pulling out and destroying more rose bushes due to RRD.

I hope there is an easy and economical solution soon in regards to controlling and hopefully eradicationg RRD.

It is also possible that rugosas reported to be infected by the general public were actually suffering from herbicide damage since an actual test was not available. I do not have the details on how Maryland determined that rugoses were: "seem to be very resistant to possibly immune to the disease." Now that an actual test has been developed, hopefully, someone will conduct controlled tests to check the Maryland report.

Is the American Rose Society funding any rose rosette research?

I haven't heard the results of the first year, yet.

-----------------
re R. rugosa.

Early on, in the garden we followed at Lincoln Memorial University, there was also a plantings of many Pink Grootendorsts near a building that had been the Dairy. They did not get sick for several years as the modern roses planted immediately downwind of multiflora-rich field whose plants were at least 30%infected with RRD.
At one time we found some strange swellings on the PG canes, and they made the rounds of a number of Plant Pathologists; no idea what their problem was, but it was just the swelling. Then five or six years in, a plant got two canes that were even more thorny, whose new growth spiraled, whose leaf margins were different and whose blooms were messed up badly.

Now I wish I had made scans of the canes, but we were busy with other plases of following the disease as it spread.

The problem with the declarations that certain roses don't get RRD is that no one has ever taken the spectrum of all roses species and planted them in different USDA zones and left them in high disease pressure areas for a five to seven year period.

What I've seen this winter, when where I live is zone 7 low temperatures, is that the plants with RRD have grown through winter....at least the parts with RRD have. The uninfected canes have gone semidormant.

There's so much that we don't know.

Webinar: Create A Plan Of Attack For Rose Rosette Disease
Rose rosette disease is poised to have a big impact on your store in 2013. NovaFlora's Michael Dobres will address simple prevention measures that can help reduce or eliminate the incidence of this disease in this webinar on February 13.

http://www.rosebreeders.org/forum/read.php?2,50305,50307,page=1#msg-50 307

http://www.rosebreeders.org/forum/read.php?2,50305