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Ann - input on possible RRD symptoms

Posted by buford 7 NE GA (My Page) on
Mon, Nov 5, 12 at 19:37

Hi Ann, I should preface this by saying that most of my roses have a lot of new red growth, the product of some heavy rain we had a few weeks ago and still mild temps. However, I did notice the tip of one cane on Madame Lombard that looked suspicious. Not just the color, but the curve of the cane and leaves and the size of the new growth vs the old growth.

Here is the new growth where it has emerged from the existing cane:

Here is the curve in the leaves

Here is the tip of the cane. The buds didn't appear distorted.

I didn't get a picture of it, but the cane sort of dipped down and then back up again, like a hook. We have had a lot of wind lately, and even though the temps have been mild, we have had some very cool nights. That could explain some of the symptoms.

I cut this cane down as far as I could. None of the other canes have this type of curve or curved leaves. Just wondering if you could see something definitive. If not, I'll probably just watch it and see what happens next spring.


Follow-Up Postings:

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RE: Ann - input on possible RRD symptoms

If that was a fuchsia, I would say it was suffering from Fuchsia Gall Mite.

We DO grow Mme. Lombard, and while she does get lovely red new growth like that, I've never seen anything like that on her.

Jeri


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RE: Ann - input on possible RRD symptoms

Hopefully, Ann will see your post. Meantime, it looks like RRD to me. I'd cut out the cane, as you did, and hope I caught it. Good luck!!!

There is something else that causes something like the elongated buds and crinkling in the last photo, but I can't recall what it is. I'm in a heavy RRD locale and so I always assume the worst and cut first and diagnose later. If you cut it out and it doesn't repeat, you either caught it in time or it wasn't RRD.


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RE: Ann - input on possible RRD symptoms

Hi Buford: I removed my first RRD rose this past July. My first instinct when I saw your pics is: Yes, it's RRD. The crinkled & bright red & curly leaves were on my RRD plus very dense thistles. From the RRD sites I visited, they state that excessive thorniness may NOT be manifested, but it's still RRD.


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RE: Ann - input on possible RRD symptoms

That looks like the RRD I've seen manifested on some teas and tea-like Chinas--both 'General Gallieni' and 'Miss Lowe's Variety' displayed the same growth pattern.


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RE: Ann - input on possible RRD symptoms

In agreement with the positives above.

Just counting symptoms:

caliper (cane widths)

internodal distances (on the 'rooster tail')

epinastic leaf distortion

sepals are very variable (when they shouldn't be)

it's pushed too much red growth too rapidly, there should be a transition to green.

(And the obvious, that we sort of take for granted, with less than 12 hours of sunlight, we expect growth to be slowing down as winter approaches, not speeding up.)

See my about to be posted R. x fortuniana discovery of earlier this afternoon.

If you still have it, could you see if the pith is huge compared to the bark/camb. part of the new cane?

Ann


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RE: Ann - input on possible RRD symptoms

I tossed that one cane. I forgot to post this picture that showed the weird curve:

Ann, I do have a lot of new growth on many of my roses. And I'm still getting buds forming. We've had a light frost, but not a hard one. Plus my front yard has full southern exposure so the rose there get a lot of sun.

I've decided to wait and see what happens next spring. The rest of the bush looks fine, new growth is greening and stiffening up. I will check some of the canes to see if the pith is huge compared to the bark.


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RE: Ann - input on possible RRD symptoms

Sorry, forgot to say thanks!

So this is now RRD #2. I guess it's just a fact of life now. Have to be extra vigilant this spring as the roses leaf out.....


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RE: Ann - input on possible RRD symptoms

The curve happens because of the weight of the fast new growth, it pulls the pre-existing cane down and the new growth tries to go UP at all times.

Something else really interesting here, though. The massive new growth out at the end is very probably the first point of infection, and then it very, very slowly moved down the phloem to that leaf axil bud that has just begun to break. (which is the same thing I saw on Fortuniana this afternoon).

My guess for now is that we both got lucky as did our roses.


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