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rose stem girdler
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Posted by
campanula UK Cambridge (
My Page) on
Sat, Jun 23, 12 at 17:40
| I have never come across this in my roses before - didn't even think it was a UK problem but looking at Ghislaine de Feligonde, there is no doubt that some sort of girdler larvae or insect is at it's heinous work. Noticing the drooping stems with unopened buds and even dead crispy leaves, it quickly became apparent that areas of cane are entirely munched away. Obviously, I cut the canes back to behind the damaged areas but am somewhat freaked out. So, what to do now? |
Follow-Up Postings:
RE: rose stem girdler
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Coraebus rubi has been a problem here for some years: is that what you're dealing with? It doesn't kill the cane in most cases, but weakens it considerably, though some roses are particularly susceptible. My 'Canary Bird' (or is it R. hugonis?) was massacred by it, as its canes tend to break at the point of attack, and I've heard that Rugosas behave similarly. Teas, on the other hand, usually hang on to damaged canes long enough to grow replacements. C. rubi likes to attack one year old canes, i.e. the rosebush's future, which is particularly irritating. So far this year I haven't seen (yet) much of this kind of damage, which is a blessing.
You may have a different pest. I've never done anything about our cane girdler, and the damage has generally stayed within bearable limits. I almost always find the damage well after it has occurred, by a swelling on the cane. If the cane breaks or if you cut it below that point, you'll find a spiral track going round and round the the cane, eaten between bark and the inner wood.
Melissa |
RE: rose stem girdler
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| I had a cane girdler a couple of years back; turned out to be a rabbit. |
RE: rose stem girdler
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| Melissa, as an eternal optimist (and lazy to boot) I have often failed to pay much attention to pests or diseases until I get whacked on the head (often literally), so I honestly have no idea. This has been a particularly trying year with the usual fruit issues, early blight and galloping blackspot (something which tends not to appear until later in the summer). Cannot decide whether to break out of my eternal complacency and go for the preventative measures (but this means thinking ahead....and thinking of doom - not a situation I am comfortable with) or to just deal with stuff as it happens - and not forgetting my preferred third option which is to ignore it, use selective vision and hope it 'goes away' this season or next. I am filled with admiration for the plant pathologists/Pippa Greenwoods of this world but it is a way of life I really don't want to have to deal with (yet) myself. Head in the sand nearly always gets my vote but often to the detriment of health. |
RE: rose stem girdler
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| If you don't want to learn about the various borers and girdlers in your area, just be on the lookout for wilting stems with hollowed (squeezable) canes below and canes dying above swellings; cut below the damage and destroy the larvae so they don't mature and lay eggs for next year. |
RE: rose stem girdler
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| I have cane loss to rose stem girdler every year here. The fields and woods are rife with brambles which apparently are a favored host plant, but we love to harvest the fruit of those wild raspberries and blackberries. I'd have to get rid of all of them to eliminate the chances of these pests getting to my rugosas and various other roses. Not likely. It's irritating, but as Melissa says, usually "bearable." It just comes with the territory, kind of like rose chafers from the neighboring hay fields eating up most of my once bloomers' flowers. |
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