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| I have had some RRD problems in a corner of my garden. I have removed three ramblers and am monitoring a third. Now a nearby hybrid musk (Prosperity) that I mean to transplant has some funny growth. There are three overly strong laterals growing off the main cane of this rose. I cut two of them off already but you can see how they grew. No witches' brooms yet. I wonder if I should just trash it rather than move an infected rose to a supposed RRD-free area. What do you think? |
Follow-Up Postings:
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| Can't tell, but I certainly would waste the time transplanting it until you know for sure. |
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- Posted by maureeninmd z6 MD (My Page) on Mon, Nov 26, 12 at 22:46
| Maybe I am paranoid but these laterals are so much bigger than the others. This rose was larger than I realized and I had to keep pruning it so that it didn't grow over the fence as my neighbor has a shed adjacent. I removed a Rosa virginiana - tried to like it but it was so ugly and uninteresting - and was going to replace it with this Prosperity. A rare spot for something big! I am moving things now, I know not the ideal time, but I prefer to work in the cooler weather. I cannot get everything done in the Spring before the heat sets in. |
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- Posted by Strawberryhill 5a IL (My Page) on Tue, Nov 27, 12 at 10:10
| RRD is transmitted by a wingless mite. I trashed a rose infected with RRD in July. I also sprayed the surface soil with Windex (very alkaline, also kills ants). None of my other 42+ roses are infected. I would play it safe, NOT to move the bush in question, but watch for symptoms of RRD in spring time. |
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| I don't usually see initial RRD symptoms show up as large laterals at the base of the rose like you're showing. Infections I have had on my roses are usually on the bush somewhere toward the center or top on an outside edge, and can come later as lower laterals as the infection gets a good foothold in the plant. It seems like a shame to waste the relatively good transplanting weather that we've been having, but I'd wait and see. |
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| I'll play Devil's advocate here--from my experience, RRD doesn't seem to transmit quickly or easily from one rose to another within my garden, since control measures (amputation of affected branches/limbs) have been quite effective. Personally, I think you would have plenty of time to identify RRD-infected new growth and eliminate your moved rose before it spreads to other plants next spring if you are vigilant. Of course, you should be careful to do only what you feel comfortable with. Don't take any unnecessary risks, but playing it completely safe isn't always the best option either. Stefan |
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- Posted by Strawberryhill 5a IL (My Page) on Wed, Nov 28, 12 at 10:04
| This is the best site among the countless sites on RRD that I visisted. It's University of Arkansas Extension & Research, the below link stated: "Infected plants must be dug and removed completely (including roots)... If possible, remove multiflora rose plants from vicinity (100 meters) of cultivated roses, especially if upwind from cultivated roses Space plants so that canes and leaves do not touch (this prevents mites from crawling from one plant to another)." |
Here is a link that might be useful: University of Arkansas Pest Management
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- Posted by maureeninmd z6 MD (My Page) on Wed, Nov 28, 12 at 15:11
| Stephan - I think RRD spread in this area because I was oblivious (for months!) about a badly infected Veichenblau growing over a shed two years ago. The New Dawn on the shed seems fine but a Paul Transon about 20 feet downwind showed witches broom growth this year. I just took it out along with an adjacent Albertine as they both really needed at least 20 feet each - space I don't have. This Prosperity is the next rose downwind. I am just going to go ahead and move it as the new spot is a bit away from other roses. I removed growth similar to that on the Prosperity - laterals larger than the main cane - from an American Pillar growing on an enormous pine nearby. I'd really hate to lose that one. I don't worry too much about red growth as that is normal for so many of my roses. I was trying to find some something I read in Ann Peck's ebook about the mites dropping near fences and hedges? My quarter-acre property is almost completely enclosed. Thanks for all the input. |
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- Posted by mad_gallica Z5 Eastern NY (My Page) on Wed, Nov 28, 12 at 15:30
| It isn't the mites dropping per se. It's that wind currents slow down/speed up in relationship to barriers. In the past, I've found several good explanations/how tos regarding snow fences on the web. It's basically the same principle in reverse. |
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