Is the same critter thats killing the hemlocks here in PA? The wooly adgelid? I have friends in the forestry service and none every mentioned a pesticide for these. I know they were trying to raise beetles or wasps which would kill them. They cost about $150 a piece.
I only know it as the pine beetle.
Nasty critter: has killed millions of (local) pine trees: denuded yards in my neighborhood, local scout camps, etc.