Sorry, I know see that the information I recalled reading was an earlier post that you participated in:) That first photo does have a waspish look to it though. Lisa

Carpenter bees will do that.

Vaporac I searched for information on carpenter bees. On several pages I have read that the entrance hole made by these insects on the wood is 1 cm (0.399 inches).

It is a bee type of considerable size. Keep in mind that the bee penetrates the wood. Therefore, the hole made in the wood must have a fairly large diameter.

The galleries that perform the insects in the reeds of my roses do not measure beyond 0.11 inches.

Given this information I would say that it is not carpenter bees. It must be another insect but unfortunately I can not identify any specific insects in the images of these dry and dehydrated insects from my photographs.

Perhaps another forero to see the images know of which insect it is.

The problem is that there are many bees and wasps that will use canes as homes for their babies. Plus there are other insects as well i.e. raspberry cane borers and others. It is not that bad for me since my winters tend to kill the canes anyway.

There are more than 500 species of carpenter bees. So more than likely mine guys would not be the same as yours. In most cases the bee does not enter the canes as far as I know. It drills into the cane places a lump of food for the kids. Then deposits her eggs and seals the hole up.

They love to use my phlox. At the beginning of October which is early for many. I cut them back then have to cut diagonally into cane till I find the bores. These are mostly the white wormlike ones. It is a pain for sure but it has to be killed or there will be even more of them. If I wait to long these types will enter the crown and eat all winter.

My point is it would be all most impossible for us to find your culprit and you won't find the actual bee etc. in the cane. I have found them before by watching mommy bee continuing to return to the same plant. So I got up by the plant sat down on the ground and watched her work. That was interesting.

Patty, I have the impression that insects (sheep, wasps, worms or whatever ...) enter the reeds of my rose bushes, not just above.

I see that there are small holes in the sides of some reeds.

This afternoon I cut a branch of a rose bush that had a small hole in the bark and I saw this:

It can be seen that behind the hole there is a piece of marrow eaten by the insect.

I thought that maybe sometimes the insects could enter one part of the cane and go out for another? Is it an absurd possibility?

If I am right and the insects make small holes to enter, I see the solution of the problem impossible. It can cover with white tail the cuts of the branches effected in the pruning ... but the small lateral holes? Impossible!!

I’m sorry I know that this is old but I never saw the last response until now. I am once again looking up borers and this came up.

El Jardin, I’ve often wondered how this effects roses in warm climates. All of my roses lose their cane in winter. So it is not such a bad thing here. In a warmer climate where cane is kept a person might have no idea why a rose or cane is no longer productive. Your rose looks as thou it was home to many babies.