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barefootgirl_ls

RRD and winter damage

16 years ago

Toward the end of last year, my Awakening climber started showing some bizarre growth. I've seen RRD before (on a multiflora that was here when we moved in), but my neighbor had also sprayed a ton of Roundup on a pile of fill dirt before he spread it all over his yard, so I thought there was a chance it might be Roundup damage.

Checking out the winter damage today, I saw both of the canes that were showing odd growth are now dead. The third major cane, which was growing normally as of last year, is still looking green but unlike most of the other roses has not begun to bud.

Are the dead canes a sign that it was RRD and not Roundup drift? Awakening has been an insanely hardy rose in the past, green to the tips every spring going 8 feet in either direction along the fence, and this was not a bad winter as Ohio winters go. I cut both of the dead canes back to the ground. Should I give up on the third cane too, dig the whole thing out and burn it? Wait and see what the new growth looks like?

It was always such a healthy beast, it broke my heart to cut it down today.

Comments (7)

  • 16 years ago

    I'd wait and see. If it was RRD, any new growth will exhibit symptoms. If it was roundup, it may show some but they shouldn't be as severe as last year.

  • 16 years ago

    I've seen what looks like RRD occasionally on my roses. I cut off the cane or, at least, well below the diseased cane and it didn't return. I'm not convinced everything that looks like RRD is RRD or, at least, an automatic death sentence.

    Last year, some of my real troopers failed to do much. They pretty much sulked all summer. But this year look like they're ready to take off. Awakening might be doing something similar.

    I'd do as Karl recommends, wait and see.

  • 16 years ago

    I think a few clarifications are needed.
    RRD according to Epstein and Hill, the profs who studied it and encouraged its spread, found that RRD interferes with the plant's ability to convert sugar to starches which, in turn, interferes with a rose's ability to survive winter and come back the following spring. They even illustrated a simple test of cutting a stem and testing with medical iodine the presence of starch and the total absence of starch they said was evidence of RRD. When I visited Jim Amrine, we found that there were some starches in early summer in RRD infected canes, but not comparable to what E&H illustrated.
    A friend burned RRD infected rose canes and found them (undried) to burn very fast, surprisingly so.

    You might have gotten lucky and the disease not spread all of the way down the canes into the roots. IT it got into the roots, you will see hideous aberrant growth by midsummer.

    RRD IS an automatic death sentence if you do nothing at all for two or three years.

  • 16 years ago

    Thanks Ann, that's what I was wondering -- whether it might mean something when such a previously robust and tip-hardy rose died back to the ground, while the tender varieties all around it suffered very little damage. I imagine I'll be looking for a new Awakening before long.

  • 16 years ago

    RRD interferes with the plant's ability to convert sugar to starches

    That probably explains the rubbery stem symptom, doesn't it?

  • 16 years ago

    I hadn't put that into the rubbery stem bit, but it makes sense that it takes longer for the stems to get un-rubbery.
    Especially when the stems are six feet long and still flexible.

    The first part is that growth is so fast that normal HTs will only be soft at the outer two or three inches but RRD new canes may be flexible for twelve to fifteen inches.

    That first RRD that was brought into my rose garden by a visitor (detailed in the ebook) and was Double Delight bent like a lariat...Thanks, York.

  • 16 years ago

    I'm by no means an expert, but it just seemed logical to me that if the virus interferes with the reaction where the sugar molecules are joined together into starch polymers it may well also interfere with the reaction where those same sugar molecules are joined together into cellulose polymers (the polymers are identical except for the orientation of the glucose units with respect to each other), and if I remember correctly the stem can't get stiff until those cellulose polymers have been created and set in place.

    Like I said, I'm no expert. It just seemed like a plausible hunch to me.