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Rose canes , what's wrong?

4 years ago

Can you tell me what is on these canes. I think the white bark is just old canes. The white spots and others not sure of. Thanks!

Featured Answer

K S 7b Little Rock (formerly of Seattle)

4 years ago

If it is scale those little spots will be actual insects that look like a sort of flat limpet -- you can pry them off with your fingernail. If they are scale insects, then scraping them off and, if I remember correctly, using an alcohol-based solution (do a google search for percentage of alcohol) is supposed to help. If it is fungal, then I can't say what you should spray (since I don't spray). If only a few of the canes look really bad you could prune just those off for now. I remember that Jeri said something about fresh horse manure for downy mildew -- I've wondered if there would be other fungi that would also be impacted by this treatment. It probably wouldn't hurt to try something like that as an experiment if you have a neighbor with a horse (and if it works let us know).

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Comments (10)

Alana8aSC
Original Author
4 years ago
jerijen
4 years ago
The purple blotches look disturbingly like Downy Mildew?
Alana8aSC thanked jerijen
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I also think it looks like canker. The organisms that cause canker are around all the time and enter through the "skin" of a plant when it is injured, cold can cause injury so that spring is a common time to see canker damage. If the canker encircles the stem, all nutrients are cut off and the stem above the canker dies. If the canker does not encircles the stem, then it should recover. I agree that pith will show if the stem is alive or not, but you must cut off the stem off to see the pith, it is that corky stuff in the middle of a stem, but now the cane is dead for sure. You can check for life under the bark with the scratch test, and as long as there is green under the brown, there is hope. It can be false hope because the stem could have died below where you scraped and the top of the stem as yet to die, that's why a stem can continue to produce foliage for a short time even after it is dead lower down. In my experience, you can kill a weak plant by pruning off all the canker damaged stems, when if you just left it alone, it be would be ok. You can always prune the stem later if it dies, If it is a vigorous plant then pruning it won't hurt, do clean your cutters after each cut. You do not want to spread it to healthy wood.
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Alana8aSC
Original Author
4 years ago
last modified: 4 years ago
The only thing is I'm having no leaf issues or leaf drop. The best I can come up with was scale and a type of canker. But I don't know never having dealt with any. I was looking at downy mildew too, but it said it started with leafs? So does it just be in the stems? It has been wet and cold and/ or chilly. So I need to use insecticidal soap? Will that take care of everything? Do i need to cut the whole bush down and spray? I really need guidance. First rabbits, now this..o well, not stopping me yet.
jerijen
4 years ago
No. I think you would also see it in the leaves. But in that case, I dunno what it is.
Alana8aSC thanked jerijen
Alana8aSC
Original Author
4 years ago
last modified: 4 years ago
Ok did more reading. So I read somewhere leaf symptoms are advanced symptoms. So I'm going to treat it as such. After bloom, since Ive done took most of the canes anyway. After bloom, I will trim it to mext to nothing. Get rid of all I cut off, and spray with copper fungicide. Think that will work?

Any idea on white spot?

Maybe I'll have time to spray some copper fungicide tomorrow too. We are supposed to have rain for the next week.

At any rate, even if it's not that ,I'm sure thr CF won't hurt, right?
K S 7b Little Rock (formerly of Seattle)
4 years ago
Anthracnose?
Alana8aSC thanked K S 7b Little Rock (formerly of Seattle)
Vaporvac Z6-OhioRiverValley
4 years ago
Use and oil spray? I've read it is good for scale if that is what you have. Otherwise I have no suggestions except possibly copper.
Alana8aSC thanked Vaporvac Z6-OhioRiverValley
Alana8aSC
Original Author
4 years ago
last modified: 4 years ago
I've done horticultural oil. Twice. Would that have helped if it was scale? Ok so I think I will just cut out the blotched canes and spray with copper. If it's anthracnose, or Downy it should work for both, correct? Also I sealed cuts with fingernail polish, because I have found borers for the first time, this year. That should work right?
Alana8aSC
Original Author
4 years ago
It's not scale then. Its probably from all this rain and cold weather. I'll get some freh manure. There is actually some horse pens behind my house, two feilds down and will try that. I forgot about the horse manure. I read that post and forgot about it, so many thanks for reminding me!

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