identify ambrosia beetle

Asked September 24, 2020, 5:13 PM EDT

A large chestnut oak has died. I collected a larva from under the bark. The xylem (I think) is filled with fungus, and smells nice & mushroomy. I'll upload pictures of the larva and the fungus. Can it be identified? Is it the native kind or the invasive kind?

Montgomery County Maryland

1 Response

This is not an ambrosia beetle larva. This is a type of longhorn beetle (cerambycid). They are heartwood dwellers and can cause structural problems in a tree. We cannot necessarily say if they contributed to the loss of your oak or if they are secondary invaders (took up residence once the tree was already weakened and declining).