I have a Styrax Japonicus tree that has been infested by worms which have bored through the trunk and into the heart wood center of the tree.  I have a picture of the worms, but can't see how to attach it.  They are 2+ inches long, white, with a brownish mouth, segmented body.  Looking for an identification and best practice for ridding the area of this pest.

Thank you,

Cynthia Hedstrom