The carpenterworm leaves a very impressive exuvia behind when it undergoes metamorphosis from a pupa to moth. These will remain behind in the holes after the mature moth has left. The hole in the photo on the left is about the size of a dime.
Chemicals have limited effectiveness against carpenterworms. Read the following bulletins carefully before attempting to use pesticides.
- Carpenterworm IPM - University of California Extension
- Carpenterworm - Washington State University Extension
- Carpenterworm - Utah State University Extension