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| Rose rosette disease, blackspot, and Japanese beetles. I'm battling all 3 on my roses right now, and it's discouraging.
I need to go out tomorrow and dig up 4 RRD roses. They started showing symptoms about a month ago. Didn't realize until now that the excessive thorniness (shudder) is RRD. Even if I remove those roses now, is it likely that they've already infected all of the other roses? I've been spraying Greencure religiously after every rain, but the BS is still bad. Lower branches on some leaves are defoliated. And the JBs. What can I say? We handpick hundreds every evening. Is there an easier way? (Please don't tell me to only plant resistant varieties, b/c I thought that's what I did.) Is it likely that my garden of 100+ roses have been infected by the 4 roses with RRD? Please share your experiences with removing RRD vector plants and preventing the spread of this disease. |
Follow-Up Postings:
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| I've just learned about RRD too. I've found that now that I know about it, I check every rose I walk or drive past. LOL Those excessive thorns are creepy looking, aren't they? I removed one yesterday, and am holding my breath watching the others. I think whether a rose becomes infected seems to depend on so many variables. Have you seen this website yet? |
Here is a link that might be useful: Rose Rosette Disease
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- Posted by melissa_thefarm NItaly (My Page) on Sat, Jun 30, 12 at 8:02
| It does sound discouraging, and you have my sympathy. I wish you better days soon: they will arrive. Melissa |
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| Nothing is easy as far as RRD is concerned. The blackspot and JBs can be handled by spraying. Unfortunately organics don't work very well. You can try Milky Spore for JBs. I had to take out a rose earlier this year with RRD. My neighbors rose had it. I'm not sure where that rose got it from. |
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| No cure for RRD, and not much of anything works very well with JBs. Get rid of the RRD plant, and wait for JB season to come to an end (and keep on hand killing them every night). The only thing you can have any control over is the BS--if you spray occasionally with Bayer Garden Disease Control for Roses, Flowers, and Shrubs. If you don't want to spray, then there is not a lot you can do to control the BS either. Facts of life in a rose garden--unfortunately. : ( Kate |
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| No, the whole garden will not have been infected with RRD. Maybe a couple more. GreenCure (potassium bicarbonate) is very effective against powdery mildew, not so much against blackspot. Combining it with oil (horticultural spray oil or neem oil, dose as labelled) makes a more effective spray, but the summer months are often too hot for oil--it will burn the foliage. Between the three evils you mention, eastern US, zones 6 and 7, is a really tough area to grow roses, but lots of us do it and enjoy it. For JBs, as long as they are very bad, I recommend just cutting off all the flower buds that are near opening. You will feel better doing that than watching all the flowers get ravaged. The floral scent attracts extra JBs to the garden. If there are no flowers open, you can spray insecticide in good conscience, if you get tired of collecting beetles by hand. You can also protect a few flower buds by tying sections of panty hose or white plastic over them. |
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- Posted by gardenerzone4 4 (My Page) on Sat, Jun 30, 12 at 16:50
| With this heat (heat index 103 today), the thought of having to go dig up big roses that have RRD has me cringing. When is JB season over? I think I will cut off all the blooms instead of leting them be ravaged. The JBs have eaten the leaves of my lindens to lace, and are starting to lace the rose leaves too. Somebody give me some zen! |
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| If you are not up to digging RRD roses right away, cut down the canes in sections and bag them to contain the vector mites. Paint the fresh-cut stubs with full-strength Roundup. Dig at your leisure over a few weeks. |
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- Posted by gardenerzone4 (My Page) on Sun, Jul 1, 12 at 23:53
| Thanks, michaelg. I did dig up all 4 roses yesterday. It wasn't as bad as I thought it would be. All were own root roses. My climber, Eden, was the most difficult to dig up. But I know that some of the roots broke off on all 4 roses and remained in the soil. Can I just leave those root pieces to rot where they are? I'm leaving the space for these 4 roses fallow until next spring. By April 2013, will it be safe again to plant roses there? |
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| There's a chance that a large detached root will send up an infected sucker. There's also a theoretical chance of root grafting between a surviving root and the replanted rose. So you might want to dig some more, at leisure. I have replanted immediately after removing an infected plant. |
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| I lost 5 roses to RRD 4 years back. Since then, there have been no new infections. Around here you have to spray to prevent blackspot. The Japanese beetles are a mystery. They seem to have disappeared lately. A few years back there were so many beetles that you couldn't walk around the garden without them crashing into you. Just than the stars that you don't have rose midge! |
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