protection of bark on rose bush
Have two very old rose bushes. Have noticed this year that the bark is being attacked by an insect, which we call red back. Am situated in middle France for most of year. How can I prevent this?
If you have a product called Sevin there, I would obtain that and spray the rosebushes down with that product well. Then reapply it in 10 to 12 days. If Sevin is not available there, please consult with a local rose society to find help.