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Prepping for a Rose Rosette scare
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Posted by
michaelg z6B NC Mts (
My Page) on
Sun, Sep 9, 12 at 13:38
| I had a terrible outbreak of RRD this year, losing a number of roses. In addition to losing plants you're fond of, having great gaps in the garden, and sweating to dig up big old shrubs, there's the anxiety of diagnosis, fear that you'll allow the disease to spread or, on the other hand, that you'll euthanize a plant that's actually not terminal or even sick.
So, that shoot looks weird, but am I sure this variety doesn't normally produce shoots like that? I wanted to suggest that everyone in RRD areas tour the garden and study the normal new growth at a time when roses are making strong growth. Particularly, RRD on many (not all) varieties causes shoots with red stems, beet-red leaves, and red awl-shaped thorns that stay rubbery some distance down the shoot. Do you have any varieties that produce beet-red new stems or leaves in normal new growth? (For example, 'Chrysler Imperial' does normally have beet-red new leaves.) How about awl-shaped thorns, red-veined leaves, multiple shoots from the same bud site? Take notes if you aren't confident you'll remember. Make this tour more than once.
The other thing is not confusing herbicide damage with RRD. Find out if your yard people use herbicide in any form, and when. Ask the neighbors to alert you if they use herbicide anywhere near the roses and explain why you need to know. Always review your own herbicide use when suspecting RRD infection.
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Follow-Up Postings:
RE: Prepping for a Rose Rosette scare
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Thanks for the reminder that sometimes other things cause odd-looking new growth...chemicals, hmmm. Unfortunately I've had at least two Knockouts with unmistakable "witch's broom" RRD branches. Just knockouts. They were both moved to a hedge we made by digging up the twenty or so knockouts the previous owner had literally polka-dotted all over the yard. Please don't beat me up, but so far I'm cutting out the diseased branches and leaving the rest. (cowering here.) Laura, who knows she should rip out the bushes and burn them |
RE: Prepping for a Rose Rosette scare
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| "Do you have any varieties that produce beet-red new stems or leaves in normal new growth?" Yes - about half the roses in my garden, which are tea roses, which do this all of the time. In fact, that's how I spot the new growth - it is always red. China roses tend to do this too. I realize that RRD is a very bad thing, but folks should not panic just because they see red new growth. Jackie |
RE: Prepping for a Rose Rosette scare
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- Posted by maryl Z7 Okla. (My Page) on
Sun, Sep 9, 12 at 14:48
| I'm more familiar with RRD then I'd like to be, having had it numerous times. This year I spotted it on a rose that years ago had a bad outbreak of it, but after cutting the offending canes back to the crown has been symptom free until this year. The "odd" looking new growth hadn't grown very much when I took it off, so hopefully I've saved this plant again. When this happened I was reminded of something Ann had mentioned in one of her many informative posts on this forum. Roses that are exposed to the prevailing winds are usually the first to get infected. Obvious why that would be - mites traveling on the wind land on the first rose that presents itself. This had been proven in my garden to be very true. So for instance, if your prevailing winds are out of the south or west, pay special attention to those roses.....Maryl |
RE: Prepping for a Rose Rosette scare
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| I endorse maryl's tactic of cutting an infected (or strongly suspected) RRD plant down to the crown and watching the regrowth carefully. It seems likely that there could be infected mites on parts of the plant that haven't shown symptoms yet, so by cutting it down you reduce the chance of re-infection of that plant and also spreading infected mites to other plants. Be sure to bag the cane sections and every leaf immediately, unless you have sprayed thoroughly with something sticky. I have saved (knock on wood) a couple of plants this summer with this tactic. A third made some normal-looking shoots to start with, but several of those shoots produced secondary growth that was symptomatic, so I dug that plant today. I wish I had started doing this back in May when the first plant showed the first symptoms. Laura. believe me, you are taking a great risk. |
RE: Prepping for a Rose Rosette scare
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| Just a question.... does multiflora show symptoms the same as others? I have been monitoring the wild multiflora in the woods abutting my property, so far none of the symptoms. I do kill what I can of it, but there's so much. |
RE: Prepping for a Rose Rosette scare
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- Posted by TNY78 7a-East TN (My Page) on
Sun, Sep 9, 12 at 19:40
| Thanks for the post, Michael. The Paw Maw plant that I posted pictures of a couple of weeks ago seems to have just been a happy plant. After the growth matured, the canes and thorns looked just like the ones on the rest of the plant. I'm glad nobody caused me to overreact and pull a perfectly good rose that was doing well :) Tammy |
RE: Prepping for a Rose Rosette scare
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Michael, I cetainly relate. Just had to cut my 10+ year old Buff Beauty. Earlier this year 8x8 feet Yolande de Aragon and my wonderful Lady Hillingdon had to go. Olga |
RE: Prepping for a Rose Rosette scare
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| Michael, I have an outbreak of RRD in my northern slope. Yesterday I counted about 8 roses with symptoms. Two were bad enough to be dug up and disposed of...Heirloom & Out of Africa. The others I did surgery on and excised the canes to the crown. If the bad growth comes back again, those roses will be dug up also...leaving a huge gap in the hillside. Two roses in the southern garden are showing symptoms, along with another two in the eastern garden. RRD is a scourge and I'm heartbroken at the amount of roses that are being wiped out. Makes me sick everytime I see those twisted, ugly canes. |
RE: Prepping for a Rose Rosette scare
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| I have a couple to add to the list of "Not RRD" new growth: Hot Cocoa - New basal canes look rather scary. Growth on a healthy plant is rapid, hyperthorny, and just weird looking, but all's well. Veteran's Honor - New growth is always deep burgundy, rubbery, and leaves are beet red until they are very large. As the bud matures, the burgundy begins to fade to green. |
RE: Prepping for a Rose Rosette scare
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| t-bred-- Wild multiflora with RRD has a yellowish cast with strong side shoots coming from unlikely sites. As I recall, the leaflets are smaller or narrower than usual. It's almost the opposite of the most typical modern-rose symptoms (dark red, oversized, hyper-thorny). What catches your eye is the pale yellowish-green foliage. |
RE: Prepping for a Rose Rosette scare
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