Detection of emerald ash borer, Agrilus planipennis, at low population density

The exotic emerald ash borer (EAB), Agrilus planipennis (Coleoptera: Buprestidae), was first discovered in North America in Detroit, MI, in 2002. This beetle has killed millions of ash trees in several states in the United States and in Canada, and populations of this insect continue to be detected. EAB is difficult to detect when it invades new areas or occurs at low density. For the foreseeable future, trap tree and ground surveys will be important tools for detecting emerald ash borer populations.