名媛直播

Hello everyone, Nice to meet you all fallow bonsai "infested" people
I have a problem with a Birch I Collected this March.
A May beetle larvae attacked it and I observed to late

This is the invador
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And this is the result.

I carved out the channel he made even the tree was collected the Spring i risked, but no larvae...so whats next?
Any advice?

Thanks!