Hello, I was trimming back some dead canes on a hydrangea today and found a few that had holes in the middle. I thought it was just the dead wood drying out until i cut further down and saw these (photo attached) metallic blue insects popping out from the cut portions. They look like some sort of really small flying ant, but I've read online these might be a small type of carpenter bee? I tried cutting the canes down as far as I could to get to a portion where the center was undisturbed, but some of them seem to go right to the base of the plant and I can't cut any further. Any suggestions on how to deal with these guys? My hydrangea struggled a bit last year so i'm thinking maybe these had something to do with it? Thanks!