Spotted stems? Should I be worried

aahlMarch 11, 2014

I just pruned and about a third of my 60 bushes has some canes like the one pictured. All seem healthy and until the very end last year I has the least disease I have had in 30 years. Regular spray program is Banner Maxx alternating with Mancozeb. Any thoughts??

This post was edited by aahl on Tue, Mar 11, 14 at 22:48

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seil zone 6b MI

Sometimes black spot will over winter on the canes and cause these spots to appear.

    Bookmark   March 12, 2014 at 11:14AM
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I have it as well on a couple of my roses.
So how do I get rid of it? What is the out come for canes like the one pictured

    Bookmark   March 12, 2014 at 12:01PM
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diane_nj 6b/7a

It is probably blackspot, as seil said. The only way to get rid of it is to remove those canes. Since aahl has a good fungicide application program in place, that should handle any issues with blackspot going forward, given that the application is started early.

    Bookmark   March 12, 2014 at 1:30PM
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seil zone 6b MI

I don't usually prune them off unless there is some other issue that would require it to be removed. Black spot is out there everywhere and whether you have some spots on the canes or not the plant may still get it at a later date when the conditions are right for it to grow.

    Bookmark   March 12, 2014 at 7:17PM
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diane_nj 6b/7a

What seil said. I don't cut them off either. Note that once blacksopt occurs you can't "remove" or "get rid" of the spots.

    Bookmark   March 13, 2014 at 8:04AM
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