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Brown/yellow cane tops
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Posted by
kentucky_rose Z6 KY (
My Page) on
Thu, Sep 11, 14 at 13:51
| Below is a picture of my rose cane. What causes the brown/yellow progression down the cane? Is it preventable? Thanks in advance. |
Follow-Up Postings:
RE: Brown/yellow cane tops
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| If you look at the base of the dying stem, there is a brown spot there which may be girdling the whole diameter or nearly so. This is a canker that has killed the bark. If dead bark girdles the stem, the stem must die. There is another canker at the top of the stem which started at a pruning wound. This stuff happens. Just make a clean cut at the very base of the stem and it will probably heal cleanly. Cankers are fungal infections that invade wounds usually during cool damp weather. You can't prevent them altogether. It helps some to make routine pruning cuts only 1/4 inch above a leaf or former leaf site rather than leaving longer stubs above the latent growth bud. The plant will not defend these stubs, so canker will usually develop there. |
RE: Brown/yellow cane tops
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Michaelg,
Thanks for the info! I will prune closer to the leaflet.
Kyrose |
RE: Brown/yellow cane tops
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- Posted by seil z6b MI (My Page) on
Thu, Sep 11, 14 at 18:08
| Spot on, Michael! I do a lot of my dead heading as I walk my roses and I just snap off below the hip. I get this exact same thing some times as a result and it's always on a cane that I snapped off instead of doing actually clipping dead heading. The tip where the bloom was goes brown and then slowly the cane yellows from the top down. I'll have to be more vigilant about not just snapping wilted blooms off! |
RE: Brown/yellow cane tops
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| i believe it is a fungal infection from the mulch. i have learned from rose experts here in the north east to rake off the wood mulch and try to use something else. The harsh winter we had made the rose weakened and got the fungal disease from the wood mulch. The public rose gardens here in the northeast do not use wood mulch. Wood mulch is instant death to a rosebush grown here with our damp short growing season. |
RE: Brown/yellow cane tops
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| i can understand how important the wood mulch is to roses grown in the southeast to preserve the soil. i know rose experts in the Carolinas disagree with my viewpoint on wood mulch. Maybe in Kentucky there are other mulches with less fungus. |
RE: Brown/yellow cane tops
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| Seil, when we snap off blooms, the neck always dies back, but in my experience it stops at the abscission joint at the bottom of the neck. I have snapped off thousands of blooms and will continue to do so. I also doubt that mulch has anything to with it. Everybody uses organic mulch. Again, occasional canker or dieback is normal, and I don't think we need to spend much energy worrying about it or trying to prevent it. It the present case, it's just one small stem. |
This post was edited by michaelg on Fri, Sep 12, 14 at 11:12
RE: Brown/yellow cane tops
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| The editor of organic gardening magazine would say that wood mulch close to the stem would cause that. Organic mulch stored improperly like in a plastic bag would cause anaerobic process not good for plants. Most gardening experts say to keep wood or bark mulch atleast 6 inches away from the stem. |
RE: Brown/yellow cane tops
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Occasional canker is not normal. i disagree. Wood and bark mulches breed fungus. Canker is the most serious of the fungal diseases and can kill a plant. Also it is important to rake fallen diseased leaves. There is a saying here.
" just because everyone is jumping off the empire state building doesn't mean you should. " |
This post was edited by sam4949 on Sat, Sep 13, 14 at 4:54
RE: Brown/yellow cane tops
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| I've been doing OK with organic mulches for 38 years, I don't keep it pulled back from the stems, and the only plants I've ever lost to canker were fall-planted roses that were mounded with dirt and then caught in a December warm spell that caused them to start into growth. Every wild rose in the woods has an organic mulch over the base of the canes. |
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