This is our 40+ year old cottoneaster hedge.
All the dark areas are infested with oyster shell scale. It's throughout the city. We've been fighting it for three years but we had to do the only fix that would work.
And now it's all gone! Because we've had so much rain the eggs haven't hatched yet so we did this just in time. A couple of our neighbours cut theirs down a couple of weeks ago and they have new growth already. By this time next year it will probably be a couple of feet high. It will be easier to shovel the snow this coming winter!!