EAB--What's the biggest drenchable size tree?

[treelooker]

We don't have a lot of ash but the green bug has arrived nonetheless. From what I read and hear, drenching works on smaller trees but larger trees have to be injected for effective control.

Is this true? Why or why not? What diameter is the threshold? I have a few big ash trees under my management, and I Hate to drill if I don't need to.

 

[FJR]

Emamectin benzoate is more effective than imidacloprid and dinotefuran, and it has to be injected. Very small Ash trees tend to be soil drenched because injections can be a little to damaging for that size.

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