Then I put some images of Rosa 'Madame de Sévigné'. As I said in the previous post, the external symptoms are the same as those of Rosa 'Falstaff' but when making sections of their stems only on a piece of branch I found the inner marrow dead and with brown spots like RF. The rest of the branches did not have the interior with brown spots.

My surprise is that I have found almost no hollow branch or with the symptoms of the dead interior as in the branches of Fallstaff. Here are some pictures of MS

However, they also had the small, secondary secondary branches and roughness in the bark, which seemed to be much older branches than they really are.

MS also had brown spots on the outside. The bark of these spots was not smooth as a healthy branch, presented as a rough touch.

Nor have I seen for much that I have looked and cut all branches every few centimeters, no insects inside.

Please, I ask for your opinion on the problems that have two of my roses

Otherwise, the symptoms were the same as those of the other rose bush.

Then I show you pictures of the other rose-tree that I have cut all its branches down, Rosa 'Madame de Sévigné'.

I would ask you to look at these pictures. Perhaps you can think of the problem that has caused this poor state of health of the two roses.

Thank you very much for your help.

Maria.

Yes that is bore damage. I have many types of insects that bore into rose and my others pithy plants such as Phlox. The only thing I know to do about it is to seal any pruning cuts. I have started to use wood glue for this purpose but I think Elmers glue or nail polish would work fine. Since I live in a cold environment my canes are usually lost to winter anyway. Some borers are capable of entering young stems without a pruning cut present. They lay their off spring who feed on the pith. Until they are ready to leave. Some such as carpenter bees the last group of bee babies will spend the winter in the canes. I finally found a good article on these bees and they do in deed use rose canes as an incubator for their babies. I found a group last week that were nearly ready to leave the canes. This was on a rose that I had not sealed. I will not make that mistake again.

Patty ... could indicate a link to that article on bees. I would be very interested in reading it.

I also ask her at what point the insects leave the canes. Is it normal that now, in June, I have not seen a single insect? Maybe they already left the reeds?

Excuse me, another question ... Cane borer roses produce these symptoms in the bark of the affected roses?

I've never had borers in my rose bushes. That is why I do not know at what time of the year they have their development.

As he says in winter incubate the eggs and then (When?) Leave the reeds.

If I were forced to seal all the cuts that occur when all the withered roses have to be removed ... I think that work, with more than a hundred roses in my garden, could not face it. Too much work!!

Or on the contrary, am I in error? Only seal the pruning reeds of late winter / early spring?

Here are two links that I just found not the original one that I read but good enough. Rose Borer Damage: Learn About Rose Cane Borer Treatment

Boring Insects That Attack Roses | Home Guides | SF Gate

Excuse my insistence. When the insects leave the reeds? If you have this probema of canes borers roses .... also have to seal all the cuts that are done when removing the withered roses in the spring after flowering? Thousands of cuts !!!

Thank you very much for the links. I will read them carefully.

I have had this problem on occasional rose branches. I have trimmed off the cane affected and the plant goes on. I have not sealed cut cane ends.

Here I only remove the spent bloom. Borers only like thicker parts of canes. However if I cut back to a thicker part of cane either I seal it or pay the price for not sealing.

Forgive my ignorance. I repeat, I never had borers in the reeds of my roses.

From what I understand the process is as follows: an insect enters the cane of the rose by the cut that was made, ie by the top.

Then make a gallery down to deposit the eggs.

And it keeps coming down ...

Then there is something I do not understand: why in my reeds, these galleries are not drawn continuously. I explain ... if you look at the photographs you can see a piece with galleries ... then the reed are healthy ... down there are more galleries ... other healthy centimeters ...

As an explanation I think that the galleries formed in this way, could only be formed if the insects penetrate in addition to the top, also by holes that make at different heights of the cane.

I'm wrong

And if I am right ... the problem of the borers is not solved only by sealing the cut that is done when pruning at the end of the cane.

If the insects also penetrate at different heights ... then I do not see the solution !!

Sorry if I am not understanding the problem of borers but looking at my photographs is very clear that it is not a single gallery formed from above continuously. They are discontinuous galleries and should therefore penetrate the sides ...

Do you get me out of my error with your explanations?

Thank you very much.

It is possible that in this photograph does not appreciate very well what I comment. But keep in mind that to take this photo I chose exclusively the pieces of cane that were infected. I did not place intermediate pieces of reeds on the mat that were wholesome.

Even if you only see these cane pieces of the image, we see that there are small spaces without galleries. Only I see it?

Is there any possibility that it is a problem other than the cane borers of the rose bush?

I say this because one of the rose bushes (Rosa 'Falstaff', in fact had a couple of reeds with these galleries, the other reeds did not have excavated gallery any.

The other rosary, Rose 'Madame de Sevigne' had only a reed with a small piece of only a few centimeters with excavated galleries. The rest of the reeds had healthy marrow.

The strange thing is that both rose bushes, growing in different places of the garden, presented the same aspect of weakness, lack of growth, aged wood of the canes ... in short, the two presented the symptoms that I mentioned in my first post.

I was told my similar problem was flathead apple borers, which burrowed into canes in vulnerable spots not ends of canes.

You are correct there are borers that are capable of entry without a pruned end. In my garden those also tend to leave when getting to the bottom of branch or cane. I am lucky that they seldom bother my roses.