Detection of Infestation
Mature beetles emerge from trees beginning in late May and lasting through October with a frequency peaking in July. Tree infestation can be detected by looking for exit holes 3/8 to 3/4 inches in diameter (1.5–2 cm) often in the larger branches of the crowns of infested trees. Sometimes sap can be seen oozing from the exit holes with coarse sawdust or "frass" in evidence on the ground or lower branches. Dead and dying tree limbs or branches and yellowing leaves when there has been no drought also signal ALB infestation. United States Department of Agriculture (USDA) research indicates this beetle can survive and reproduce in most sections of the country where suitable host trees exist.
Read more about this topic: Asian Long-horned Beetle