Polareis has a problem - borers?
After raving about this rose being so bulletproof - early this fall some of the canes went all brownleafed. Inspecting it against the backdrop of all the snow we had this weekend, it is clear on some of the canes that there is a swelling below the dead leaves. I think this is rose cane borer, which devastated my rugosa hybrids 11 years ago.
I know that I should cut off the damaged canes, very low, and dispose of them at the local landfill, not my compost heap. They are almost all huge thumb thick canes, which seems surprising, but would explain why they didn't all "flag" down, which would have been the giveaway to me, having seen that before.
Does anyone know anything about the origin/life cycle of these things? 11 years ago I used a knife to split open a few of the affected canes, and could see the grub inside. But I caught them very early - still late summer.
Have they already emerged, to do more damage next year? These big tough canes may be hard to split open, but I will try.
Heading out tomorrow afternoon to deal with this, will appreciate any insight you can share!