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Heres the problem... Treating big trees is expensive, and needs to be done every year or two...indefinitely... Figure 200-400$ per tree for the injectables.
10-20 trees, thats $5000 plus per year...
The strong chemical drenches used leach into the ground water, and can't be used often. There is a limit of what can be used per acre, and it isn't a lot.
I feel for you. I have resorted to trimming dying branches when I see them. I also am treating the younger trees, as thats cost effective.
I spray the bark with insecticides, though I am not sure it does much more than make me feel better...
Bo
If you find a solution, let me know.
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