Thanks, Henry.

This is possibly/probably? where the 2 years comes from: "Q: What was the correlation percentage found in non-symptomatic foliage on infected plants? Was the virus ever present without symptoms? We have seen about 20 percent of marked multiflora roses lose all symptoms for as long as two years, then blow up with full symptoms and die in a short time. We do not know why this happens. Do not be surprised if you see symptoms disappear then reappear later. This happens even more often in ornamental roses; this phenomenon has resulted in sale of assumed healthy plants that were really infected and later developed symptoms in complete absence of mites. It would be interesting to test a plant known to be infected but later symptom free with the DNA tests for RRD. The question is: Can the virus be detected in these plants?" Here is a link that might be useful: Q and A from webinar

"Dave Gade heard talk of rose rosette disease for 20 years before he ever saw any sign of it. As garden operations supervisor for SchenectadyâÂÂs Central Park Rose Garden and a master rosarian with The American Rose Society, he has tended a lot of roses during the 40-plus years heâÂÂs been coaxing the thorny perennials to grow. But it wasnâÂÂt until recently that the disease, which has been on the radar in the U.S. since the 1940s, hit close to home. Two years ago, Gade received phone calls from two Capital Region residents whose rose bushes had mysterious ailments. He went to take a look, and diagnosed both cases as rose rosette disease..........................Last summer, the disease reared its head in GadeâÂÂs home garden, in a bush that had been in his yard for 25 years. He also discovered it in several of the 4,000-plus bushes in the Central Park Rose Garden." Here is a link that might be useful: link for above

I added what I had on Friday. I can see the addition, but it was never recorded in the number of posts???? Title: "First report of rose rosette disease caused by Rose rosette virus on Knock Out roses in Louisiana." Author(s) : Singh, R.; Valverde, R.; Cook, M.; Owings, A. Author Affiliation : Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA. Author Email : rsingh@agcenter.lsu.edu Journal article : Plant Health Progress 2016 No.August pp.PHP-BR-16-0022 ref.1 Abstract : " To the authors' knowledge, this is the first report of rose rosette disease caused by Rose rosette virus on Knock Out roses in Louisiana. It is difficult to assess the total value of roses in Louisiana but this disease has the potential to negatively impact the thriving rose industry in the state."