What is the primary food source for the destructive larval stage of the deathwatch beetle?

Answer

Decaying hardwood

The intense wood consumption occurs during the larval stage, and their primary diet consists specifically of decaying hardwood, particularly wood that is already well-rotted or infected with dampness and fungus.

What is the primary food source for the destructive larval stage of the deathwatch beetle?
foodinsectwoodDeathwatch Beetle