New answers tagged pest
Wikipedia says usual approaches are either insecticides (possibly supplemented with electrical bug zappers to kill emerging adults), or moving the piece into a deep freeze for a few weeks (usually expensive and may cause some damage). Low oxygen treatment is non-damaging but even slower and still usually expensive.
I believe you should contact a licensed exterminator. My experience with hard to reach burrowing insects or worms was dealt with by an exterminator who has access to products we do not. For example we have had problems with carpenter bees which travelled long distances through the beams. With a puff of some powder" which the creature carries back to the ...
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