One of the most common viruses in the RMV group is PNRSV. It is a temperature sensitive virus. See http://home.roadrunner.com/~kuska/info_about_virus.htm for details. I suggest a modification to michaelg's post on Tue, Oct 13, 09 at 15:49, he stated: "Let's say "since it very rarely spreads" and avoid the recurrent squabble." I suggest: "Lets say "since it probably very rarely spreads in warm climates, unless planted close to diseased roses. The following research has been reported: "Virus spread was observed in multiple trials in which healthy bushes were planted in close proximity (approximately 30 cm) to virus infected bushes. After one year, approximately 10% of the healthy plants became infected. After two years, rate of virus spread ranged from 0% to 48% to depending on virus strain and rose variety.". In this quoted University of California, Davis study ( http://www.actahort.org/books/751/751_26.htm ) , the viruses are thought to spread underground, (possibly by the formation of root-to root grafts). --------------------------------- I feel that rose virus research in cooler parts of the country is needed before northern gardeners can confidently decide what actions/precautions to take. The second post in the following thread describes some of the present rose virus research being done in a northern climate: http://www.rosehybridizers.org/forum/message.php?topid=23447&rc=2&ui=2316041392 Here is a link that might be useful: link for on going northern climate research

comtessedelacouche (10b S.Australia: hotdryMedclimate) I started each post to you with the following qualifier: "since you are from Australia, you may find these links of use:" Please notice the use of "you may find". I suggest that if you find something in the links that you are interested in obtaining addition information / viewpoints about, that you start a new thread on that point. If your rose growing skills are anything like what I saw illustrated in the annual, congratulations!

Embothrium(Pugetopolis) I was not able to find where you are from. I am particularly interested in whether you are from a cool or hot climate as some of the rose viruses have a temperature dependent immune system such that the symptoms appear in cool weather but not in hot weather. https://sites.google.com/site/temperatureandrosemosaicvirus/home -------------------------------------------------------------------------------------------------- The National Rose Clean Plant meeting starts June 26. http://rosebreeders.org/forum/viewtopic.php?f=2&t=55690 I am particularly interested if there will be a discussion of the following paper: https://www.houzz.com/discussions/davis-virus-report-no-date-of-preparation-given-dsvw-vd~5297887?n=3

The following was stated earlier in this thread: "I have a couple of roses that do this and they are doing fine. I would ignore it and not read any remark by Henry." H. Kuska comment: It appears that some things have not changed much since the following comment was made. https://groups.google.com/g/rec.gardens.roses/c/VhgwCRP1rO0/m/Wb9k-OoUpRUJ?pli=1 ---------------------------------------------------------------------------------------------- While other things have changed: The following was stated earlier in this thread: "Rose Mosaic Virus is NOT fatal to roses. There are many separate viruses that fall under the RMV umbrella and so far I have never seen any proof that any of them will kill the rose. I know I have many infected roses in my garden and even in my cold climate it hasn't been fatal to them." --------------------------------------------------------------- H.Kuska comment: most references that I have seen say something along the line that the virus may weaken the plant to the extent that those in colder climates often lose their virused roses due to cold injury. I guess we are just talking semantics if we try to say the cold killed the rose not the virus. ----------------------------------------------------------- The following was stated by (apparently) the same author 11 years ago" "seil zone 6b MI I don't replace them either. There are so many that can only be found now with RMV that I'd have a hard time doing it anyway. Besides that in my cold zone they usually will just not come back from a winter when they've weakened sufficiently so I just dig them out then." https://www.houzz.com/discussions/1711311/rose-mosaic-virus-what-to-do