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Roses Prone to Cane Borers
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Posted by
cjrosaphile z8 Pacific NW (
My Page) on
Fri, Oct 7, 11 at 18:06
| I've been dealing with Cane Borers -- have used glue and insecticide sprayed on the freshly cut cane, which has been working. Have noticed that my Double Delight and Luminesce are much more susceptible to the nasty critters, I think because their stems are wider where the bloom is attached. Roses with smaller stems don't seem to get "bored." Anyone else notice this? If you have been successful with other treatments let me know. Thx, cj |
Follow-Up Postings:
RE: Roses Prone to Cane Borers
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| My rugosas always had more stem borer damage - to the point where I finally took out most of them. I don't know why they went for the rugosas. |
RE: Roses Prone to Cane Borers
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| There was a tv show on a while back about a rose garden in Minnesota in the August. The Hybrid Teas had dropped all their leaves and the rugosas all had cane borers. Then they showed three Buck roses that were very healthy, Carefree Beauty, Country Dancer and Prairie Harvest. |
RE: Roses Prone to Cane Borers
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| The problem in Minnesota rugosas would be the Rose Stem Girdler. As far as I know, these don't occur on zone 8 PNW, or here. The insects that bore in cut cane ends are the Small Carpenter Bee and certain tiny aphid-eating wasps. I consider these harmless enough that it is not worth bothering to control them. I watch out for the Raspberry Stem Sawfly, which lays eggs in growth tips, not in cut cane ends. |
RE: Roses Prone to Cane Borers
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| I love Country Dancer, but it isn't any less prone to cane borers here than any of the other roses in my garden (mostly Austins, a few other shrub/floribunda). The borers get after any cane that I fail to seal with wood glue. |
RE: Roses Prone to Cane Borers
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| The solution is to plant raspberry bushes. Raspberry cane borers are the main problem in the Pacific Northwest but they prefer raspberry canes to rose canes. Sealing pruned ends with glue will not stop them. Check out Everyrose's post on the link below. |
Here is a link that might be useful: Rose Borers in PNW
RE: Roses Prone to Cane Borers
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Hi cj,
I'm your neighbor to the east in the desert, and the cane borers in my garden will bore into any and every rose cane they come across. I've tried cutting back below borer activity, and to no avail--they're back again in force the next year. We've also had a problem with with cane canker in this area for the past two years. Does anyone know if the borers are carriers of the canker bacterium, or if they somehow make it easier for the canker to invade the rose canes? I am dreading a return of canker this spring. Diane |
RE: Roses Prone to Cane Borers
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| People are talking past each other. Let me suggest again that the term "cane borers" is confusing, because there are different insects in different regions that have different life cycles and different hosts, cause different levels of damage, and call for different control measures. Variously discussed on this thread are --small carpenter bee and twig-nesting wasps (cut cane ends)
--raspberry horntail (west) and raspberry stem sawfly (east and central)
--rose stem girdler (north, mainly on rugosas) Also, there is the raspberry crown borer, which only occasionally attacks roses but can kill the bud union. There is also a flathead beetle that has an M.O. similar to the stem sawfly, but I forget the correct name. |
RE: Roses Prone to Cane Borers
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| We deal mainly with the first issue you mention (attacks on cut cane ends) and I was just wondering whether I need to do a repeat glue treatment before winter. In past years I've only pruned back any borer-infested canes and glued everything in spring when I did my main pruning. |
RE: Roses Prone to Cane Borers
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| MichaelG, is there a treatment for dealing with the rose-stem girdler? Like Karen, I have a whole row of 7 'Sir Thomas Lipton' rugosas that suffer suffer cane dieback each year from these pests. I should wade in and take them out, but this task would require suit & armour because these chaps are armed with vicious teeth. Advice most appreciated -:). |
RE: Roses Prone to Cane Borers
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| MichaelG, is there a treatment for dealing with the rose-stem girdler? Like Karen, I have a whole row of 7 'Sir Thomas Lipton' rugosas that suffer suffer cane dieback each year from these pests. I should wade in and take them out, but this task would require suit & armour because these chaps are armed with vicious teeth. Advice most appreciated -:). |
RE: Roses Prone to Cane Borers
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| terryjean-- Cut the affected canes below the girdling as soon as you notice the damage and bag or burn them. This will reduce egg-laying for the following season, unless your neighbors are also raising crops of stem girdlers. If you let the worms under the bark mature, they will become winged egg-laying adults next season. |
RE: Roses Prone to Cane Borers
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| I have a large potted rose garden in Marin co.Ca. above San Francisco.I am a renter and have moved many times.Each time my garden travels w/ me to the new home.Call me CRAZY and some have, but I love flowers and plants and esp. beautiful,fragrent ROSES.Anyway in my last move I noticed an unusual amount of cane dieback in the spring.To make a long story short,after months of cutting back, seeking answers from local nursery men and women,trying various things and products to NO AVAIL,COTINUALLY CUTTING THE DEAD OFF SEEING ONCE HEALTHY,FULL VIGOROUS PLANTS DWINDLE TO NOTHING,DESPERATE I FOUND THE MARIN ROSE SOCIETY AND GOT ONE OF THEIR NICE ROSARIANS TO COME BY.She knew instantanty what it was....CANE BORERS! UGH! She said to cut the canes back and seal the ends and clean off the union buds smooth and that Icould scratch the surface of the union bud with a wire brush to encorage NEW CANE GROWTH and my plants would be as good as new.Finally I had hope.Yesterday I finished a gruelling 2 full days of cutting and sealing 75 rose bushes and trees.MY HANDS WERE A MESS CUT AND PUNCTURED,BUT IT WAS A LABOR OF LOVE! I was losing my plants at the fast rate of cane borers appetite.The infestation was so bad that I did find a very strong product from Bauer called tree and shrub insect control.Its so strong and toxic that you can only use it once a year,but I was desperate.I used it 1 month ago AND TO REALLY KICK SOME BORER-ASS,Im going to spray as soon as the winds die down with a Bondi product made with pyrithrenes,supposedly not too toxic made from chrysanthamums.I hate using chemicals but nothing was working.Well see how it goes...My beautiful Ballerina rose,which lost all but 3 spindally canes and was the 1st rose I treated is full of healthy new leaves and growth.Iam so happy.I also upped their feeding routine and plan on adding alot of rich new soil and nutrients later this year and I will take the kind rosarians advice and try to encouragr lots of new cane growth.Oh p.s. I used clear silicone glue to seal the ends.It doesnt look great,but its waterproof and permenant.Hope my experience helped you. |
RE: Roses Prone to Cane Borers
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| This is my year of watching and just sealing. I have some sort of deep cane-boring critter that has caused real problems. I've been using pruning sealant with asphalt, to really try to dissuade any more holes. I still have some new holes as other canes mature large enough to be bored into. I swear they weren't ever pruned, but then again, I do have deer. The pruning compound seems to have stopped problems on nice (non-bored) canes that were big enough when I put it on. But if they only do that once a season, it's not been long enough to tell how much it helps overall. I have spinosad, and I am able to use it without the bees getting too close in these bored-through roses. Could that help? Or would that have to be done too often anyway? I'm hoping one treatment each season might disrupt the breeding enough? Are there beneficials I could encourage or buy to help? I saw some listed for 'borers' but that doesn't even tell me the species of plant they are boring into. At least I know mine affect roses, whatever they are :) These suckers bore down feet into the rose, in multiple canes! I had thought I had the harmless bees that only took up a few inches, but not these guys. The stems literally fall over from being hollow so far into them. |
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