Roses forum→RRD on this Gallica?

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Belmont
Jun 21, 2018 6:50 AM CST
I live in NE Pennsylvania and have about 280 OGRs and species. I've seen RRD in my area but have only had it on a few of my roses, and even then I couldn't be sure if the infection occurred before I got the plants. Not sure why I have been so lucky. I wonder if it has something to do with favorable winds.

Yesterday I spotted some odd foliage on a Gallica. It doesn't look like other infected plants I have seen. I'd love to hear opinions from others, though I will play it safe and remove as much of this as possible to be safe.

This plant is right by the road, which is where one of my other two infections were.

Dennis






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Name: Patty W
La Salle Illinois (Zone 5a)
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Pattyw5
Jun 21, 2018 8:56 AM CST
I'm sorry Dennis I typed out an answer for you. Looks like I didn't post it correctly.
Went to check some photos of gallica's first because it has been a long time since I have had one. In my opinion the photo shows at least 3 things that don't look right. The surface of the leaves and the leaf edges have changed. The leaves are no longer symmetrical. There is some hyperthorniness showing and in my opinion only it does have rrd/rrv. You likely already know that rrd is not always red in color.
I know what you mean about doubting. I do the same thing here. When I catch it early I've had very good luck here at just remove the sick cane. This is on much smaller floribundas and shrub roses. They are easier to deal with.
I'm sorry about your rose. Trust your instincts they will usually serve you well.
Name: Porkpal
Richmond, TX
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porkpal
Jun 21, 2018 9:01 AM CST
I have never had Rose Rosette Virus here, but I have seen similar damage from herbicide exposure. Could that be it - especially as it is located near a road?
Porkpal
Name: Patty W
La Salle Illinois (Zone 5a)
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Pattyw5
Jun 21, 2018 9:47 AM CST
Actually, herbicides are a possibility. Could you prune out that cane and take a few more photos of the area. I was largely looking at the thorniness as the difference between the herbicides and rrd. Of course gallica's are indeed very thorny on there own. Sometimes I think that I have rrd on the brain. Seems the only think to do is prune out the bad growth and wait to see.
Thank you pork pal
[Last edited by Pattyw5 - Jun 21, 2018 9:54 AM (+)]
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(Zone 6b)
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WitchyWV
Jun 21, 2018 5:53 PM CST
The power company here has been spraying herbicide by helicopter. Grumbling I wouldn't rule out herbicide. Your state could be spraying it along the roads too. Edit* it's AEP. If you have AEP up there, it might be from their spraying.
[Last edited by WitchyWV - Jun 21, 2018 6:10 PM (+)]
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Name: Christopher
New Brunswick, NJ, USA (Zone 7a)
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AquaEyes
Jun 21, 2018 8:07 PM CST
Dennis, I'd cut that back to the ground, and sever any outlying suckers for potting-up as back-up, and wait. Which Gallica is this? I'm hoping it's not one you've collected that isn't available anymore. If so, hopefully one of the outlying suckers will be enough to get a thicket going again.

I wonder if you haven't had much RRD simply because your climate is so cold, and there aren't many "untended roses" to spread infection. It's worse in "cities", where many roses are left to linger, and no one pays attention to when they get infected. Is wild Multiflora even hardy there?

It may be herbicide, but from what I've seen of that, growth is stunted rather than "different but same size". The red foliage symptom doesn't apply to roses that don't ever express red foliage, like the pre-China European OGRs. I am concerned about the hyper-thorniness, unless R. fedtschenkoana or one of your Mosses crept into that.

P.S. Good to see you on here.

:-)

~Christopher

Belmont
Jun 21, 2018 10:15 PM CST
They don't spray herbicide on my road. I sprayed a bit recently but I don't see how the damage would happen only in the center of the bush like that.

The bush is an unidentified spotted pink gallica. La Plus Belle des Ponctue├ęs is a possible ID. I found it a mile down the road but it's gone from there now. I'm not worried about losing it because there is plenty that is uninfected in that patch. I have a small patch elsewhere in the yard, too. It is super vigorous.

I am going to cut it out in a few days but I want to show it to some visitors on Sunday. What worries me is that I will see it on other plants. As I said, I have been very lucky so far.

There is plenty of infected multiflora in the area and it is quite hardy.

anntn6b
Jun 21, 2018 10:31 PM CST
On the RRD infected gallicas, I've only seen them in June and there wasn't the reddish color on the foliage.
One thing to watch for, and I don't know what caused it, was at a garden up in Ohio, a massive gallica was transplanted one year, and the next year it was totally black. No symptoms, no spread of blackness, just black dead. (Not the gray of so many rose canes that die of old age.)

Cold weather didn't stop the spread of RRD in southern Nebraska when it wiped out Glenn Viehmeyer's Cold Hardy rose breeding program. And he wrote that he had seen the same disease in southern Manitoba.

If you can isolate the symptoms on a few canes, if it were mine, I'd pull it up , each of those canes and trace them back and cut off canes coming from the problems.

Belmont
Jun 22, 2018 7:15 AM CST
Thanks Ann, I was hoping you would weigh in. I am going to do my best to isolate and remove the cane and runners but it's a huge mess of a plant.

What do you think about cutting the cane to the ground and putting stump and vine killer on the cut cane? In theory, that should kill the roots and runners of the infected cane, but is that enough? Would the dead runners in the ground still be a threat?
[Last edited by Belmont - Jun 22, 2018 7:17 AM (+)]
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anntn6b
Jun 22, 2018 8:05 AM CST
I hate using stump killers. Too often I've seen root to root grafting taking place and the unintended consequence of other plants getting killed.

Think about how 'real' gallicas grow and spread. Their underground bud eyes are the sources of the next canes to emerge. Their real growth and spread is underground.

IF the mound is massive, a spading fork (or several) is almost a necessity. A sharp bladed shovel will at least stop the nutrient (and virus) movement along the "vascular" system of the bush (which is one bush until parts start dieing of old age. )

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