 My question is, what can I do about it? Forrester says I can put something called, where did it go? Polyphosphate 30 on it. But the company that makes this stuff won't sell it to people. It's only sold to businesses. And you've got to buy 50 or 5 gallons of the junk. What can I do to protect my trees? I would estimate somewhere between one quarter and one third of my trees are beech trees.