Hole in tree

[timndeb]

Below are a couple of photos of a small hole in my Chinese Pistache tree. Is it a insect borer hole? If so, what is the best way to treat it? I was thinking of using a systemic insecticide, but I don't think I could use it effectively until Spring. Any other ideas or is this my best option?

 

[HumBurner]

First glance opinion is it looks like a woodpecker hole or other bird hole. Would help to know more information such as geographic location.

Woodpeckers and other insect-hunting birds around here will have fruit\nut\ornamental trees holed out from stump to top, and only occasionally does it seem to impact them heavily.

If the hole(s) were smaller, I'd say possibility of being a parasitic wasp.

 

[capetrees]

any evidence of EAB of ALB?

 

[ATH]

Give us some scale. A ruler is idea...but even a pencil for finger will help.

My first guess was woodpecker like @HumBurner said...but it is pretty distinctly D-shaped which suggests perhaps a flat-headed beetle like an Agrilus or perhaps it isn't quite a true "D" and more of an oval as left by Flat Headed Apple Borer.

 

[STLARBORIST]

Below are a couple of photos of a small hole in my Chinese Pistache tree. Is it a insect borer hole? If so, what is the best way to treat it? I was thinking of using a systemic insecticide, but I don't think I could use it effectively until Spring. Any other ideas or is this my best option?

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It is possible, However I also think its Woodpecker. If your able, do a safari basil drench soil soil drench with Imidacloprid if you want to cover your bases.