Xylophagous

An insect that bores into (often dead) wood.

Website https://www.google.co.il/search?q=xylophagous+image&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjez7-64IzTAhVMJ8AKHWL-AmYQsAQIFw&biw=1097&bih=588#spf=1