Please can anyone tell me what this is and how is best to get rid of it. We have been away for a couple of months and I find my sage plant covered in these red threads. I think they arrived with some oregano last year but now I see it as a potential major problem. Should I cut the sage down to the ground or spray what is there with something.
I have pulled lots of it off but will never get rid of all of it that way.
Help would be much appreciated.