Black spots on canes?

3 years ago

I posted this on the cold zone pruning thread but then figured maybe more people would see it if I started a new one. So here are the photos. There are more spots like this on the plant, not just these two. If I prune them off it's going to be basically the entire thing! Wah. Someone give it to me straight, are these canes done?

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seil zone 6b MI

3 years ago

Yes, Magpie, when the water in the cells of the cane freezes it bursts the cell walls and causes that mushiness. On the other hand, canes that are dried out and withered looking have probably succumbed to dehydration rather than freezing. In the prolonged deep polar freeze we all experienced there was a lot of damage done. But it is early days yet. Way too soon to write off any roses. I won't even begin to prune until the beginning of April here and then just a preliminary prune. I'll wait until I see real growth starting before I begin to do any serious pruning. And I never declare a rose dead until mid-June when it's had at least a good month of real warm weather to grow in. It takes more than just a few days of warm weather for a rose to really wake up and begin to grow. Even though we feel the warm temperatures the plants roots are still in some very cold soil. It takes a long time for the sun to heat up more than just the top inch or so of soil. The rose can not begin to grow until the roots are warm and taking up nutrients again. That's where the old adage about waiting for the forsythia comes in. The forsythia will not begin to bloom until the soil has warmed up enough for it to flower. And that's when the roses should begin to grow too.

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Comments (12)

Mischievous Magpie (CO 5b)
Original Author
3 years ago
0
mad_gallica (z5 Eastern NY)
3 years ago
Where is it?

What is it?
0
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Corn meal is the easiest and most full-proof method of getting rid of blackspot, powdery mildew and even the more serious and debilitating downey mildew. 3 cups regular cornmeal you bake/cook with at the base of each mature size rose - fluff it in the dirt and water the cornmeal in. There's something in the corn meal that will encapsulate mold spores. A fun way to experiment with the effectiveness of this "fix" is to leave all affected leaves on a plant, hit the surrounding soil with corn meal, and watch all new growth come in perfect, healthy and green. It's an amazing show of how well it works and usually impresses even non-gardeners. Corn meal used in spring and a time or two (when you start noticing a problem again with the plant; usually a couple months or longer) will keep the problem from appearing at all. Turns out this works on downey mildew very well. In a yard where several roses had completely died to this fungus, I used heavy doses of corn meal in the fall. We weren't sure how it would work on such a notorious disease, but this spring all growth is very healthy and not a trace of powdery mildew even with the warm days/cool nights of spring. The cornmeal you want is the baking/cooking kind, but you can find this much less costly at an agricultural feed store in 40 or 50 pound bags - split it with a buddy or just keep it 'round to use a couple of times a year if need be. The great thing about corn meal is when you see a problem starting again, you just add a bit more to the dirt.
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I think I've had a little of every type of winter damage one can have in 8 years of rose gardening--burlap wrapping seems to be the most cost effective way getting roses through our nasty freeze/thaw CT winters. I can wait until the roses are really dormant before covering the roses, unlike mulch that freezes. It even prevents canes from snapping at the base, when we get those howling winds. At a minimum, I'd suggest cutting canes until you no longer see icky brown stuff in the center. You may need to cut them all the way back to the bud union. If you only have the bud union you need to protect it from rabbits and squirrels. I'd suggest chicken wire. Rosarians in cold climates typically bury the bud union to save a few inches of cane over winter. Some roses do well with woody canes and some don't. If you know a rose does well with wood, keep the woody canes. Brilliant Pink Iceberg is a rose that does well with woody canes. I give it a season or two and cut it out if it doesn't do well. So far, it doesn't look like I've lost anything out of the dozens of HTs and 150++ roses in our yard--but we aren't quite out of canker and spring flooding season yet.
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Well, I am certainly confused. I thought the purplish spots weren't actually diagnosed yet. Did I miss something. Can you tell me where you read this? Rosepep, I don't mean to step in on your post, I just want to know about the cane thing too. Someone will surely get here with answers. I don't know where you are located either. Carla
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Mischievous Magpie (CO 5b)
Original Author
3 years ago
last modified: 3 years ago
Where is it?

It's Munstead Wood. I was going bananas waiting for replies on here so I starting pruning, and the canes were mushy and brown in the center all the way down. Only one cane looks healthy from the outside, but I haven't done test cuts on it yet. I'm afraid to cut the last cane for fear I'll kill the rose.

Aw the last cane didn't look great either 😕 I hope it's not done for.
seil zone 6b MI
3 years ago
If it's mushy or dry and withered looking it's dead. There's nothing you can do but take it off. However, if the graft is still alive it may send up new shoots. Let the weather warm up for a while and give the rose time to start growing to see what it does before you dig it out. I can see at least two growth buds on your canes that tell me this rose is still alive.
Mischievous Magpie (CO 5b) thanked seil zone 6b MI
Diane Brakefield
3 years ago
Leave it alone. It's too early to panic. That's always what I do, anyway, and I've never lost a rose to this kind of stuff. Diane
Mischievous Magpie (CO 5b) thanked Diane Brakefield
Mischievous Magpie (CO 5b)
Original Author
3 years ago
I wasn't considering pulling it out yet, but I am sad to see that none of the canes were healthy. Why would it be all brown and mushy inside, is that freeze damage?
0
Mischievous Magpie (CO 5b)
Original Author
3 years ago
Thank you. Normally I would not have gone out to prune it so early, but when I saw those black splotches I was worried that the canes might be diseased, and so I thought I should maybe remove them right away. It was only after I saw all the insides and did some googling that it occurred to me that it might have just been winter damage. Hopefully it comes back in the spring. Fingers crossed, that was my first rose so it would be extra sad for me to lose it. But I do think it's got a chance to pull through. Dang polar vortex -18° nonsense *grumble grumble*.
rifis (zone 6b-7a NJ)
3 years ago
Munstead Wood sounds like a better answer to “what is it?” than to “where is it?”.

Unless you are in Munstead Wood, a la Midsomer Murders.
Mischievous Magpie (CO 5b)
Original Author
3 years ago
I rewrote the "where is it" question because I didn't quite understand what they meant.

Then I answered the second question.
Dingo2001 - Z5 Chicagoland
3 years ago
Magpie, MW dies back pretty much to the ground every year, and winds up around 4 ft. tall or more by the end of the summer. I bet it will be fine!
Mischievous Magpie (CO 5b) thanked Dingo2001 - Z5 Chicagoland
Mischievous Magpie (CO 5b)
Original Author
3 years ago
That's good to hear. I'll stay positive about it then. Thanks, all, you're so encouraging! 💛

Black spots on canes?

seil zone 6b MI

Comments (12)

Mischievous Magpie (CO 5b)
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mad_gallica (z5 Eastern NY)

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Black spots on canes?

seil zone 6b MI

Comments (12)

Mischievous Magpie (CO 5b)Original Author

mad_gallica (z5 Eastern NY)

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seil zone 6b MI

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