Return to the Roses Forum | Post a Follow-Up

rose dieback

Posted by emily2002 8 (My Page) on
Thu, Mar 22, 12 at 18:25

could some of you experts explain dieback to me, i.e., what causes it, can the bush be cured, etc. need help, please.

Follow-Up Postings:

RE: rose dieback

Die back often result from rose stem canker. U of Illinois Extension has a good article (see below). A few points: 1) use 70% alcohol to sterilize cutting shears 2) cut to 1/4" above a bud, but NOT longer 3) use lime-sulfur spray before putting in winter-protection 4) rose dieback is often caused by WETness, either from poor drainage, or the stuff that piled on top (wet leaves).

I get cane dieback from POOR-Drainage indoor plants that sit on a saucer (indoor herbs like basil). I learn to use better drainage potting soil, rather than MiracleGro with too much peat moss and water retention. I get rose dieback from piling wet leaves for winter protection, or putting wet soil in a bucket (bottom cut off) to winter-protect. The roses that are green to tip are protected the dry-way, like piling up bark mulch to 12". David Austin Catalog recommends putting evergreen branches on top to winter-protect. Evergreen needles are very dry and good-insulation.

On winter-protection, U of Illinois stated that roses dieback more from rose cane canker (wetness around the stem). Keeping the root moist, but the stems dry is the key to prevent rose dieback from cane canker.

Here is a link that might be useful: U of Illinois Extension on Rose Cane Canker

RE: rose dieback

"Dieback" isn't a particular pathology. There are several different fungi that cause stem canker, as the link explains. Verticilium wilt disease, botrytis blight, bacterial blight, winter damage, and cane borers (insect larvae) are other possible causes.

Canker disease is most likely to be active in the cool, moist conditions of spring, and it preferentially attacks younger canes that are still green. Some varieties are particularly susceptible. If it is canker, you see defined areas of dead bark, usually with concentric color zoning. It doesn't cause the cane to die back unless it girdles or nearly girdles the cane.

If you can post sharp, closeup pictures of your sick canes we might be able to give more help.

RE: rose dieback

  • Posted by hoovb z9 Southern CA (My Page) on
    Fri, Mar 23, 12 at 12:17

There also may be a genetic predisposition. Some cultivars consistently die back from the pruning cut ('Color Magic'). Are they highly susceptible to infection once wounded, or is die back a triggered response to wounding? That I would like to know.

RE: rose dieback

Yeah hoovb, I'd like to know that too! Here we find it is very common in Belinda's Dream, even without obvious signs of canker. In a good, vigorous specimen (which most are) it is not a problem.
This year I pruned to open up the center of the plant more to see if that helps. I don't prune them as HTs, more like shrubs FWIW.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Roses Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here