Asian Ambrosia Beetles
The Asian ambrosia beetle was accidentally imported to the United States in some peach trees in North Carolina that had arrived from China in 1974. Since then, this insect has spread all over the U.S. and has caused millions of dollars in plant loss. Every year, nursery owners spend money to prevent its damage in the southeast.
The female Asian ambrosia beetle emerges in spring from her winter habitat inside an infested tree and travels to a suitable nearby shrub or tree. She looks for a small plant or limb 1 to 2 inches thick, and begins to bore into it. She moves fast eating her way through an inch of wood per day.
As the insect eats her way through the tree, she ejects sawdust out of the entrance hole. The sawdust exiting the hole forms toothpick-like protrusions. This is the key diagnostic feature of Asian ambrosia beetle damage. Scout for this sawdust in early spring on trees and shrubs.