How long has the emerald ash borer been in Michigan?
No one knows for sure. Experts feel that it may have been in the Detroit area for at least 12 years. The initial infestation probably started from a small number of beetles. Over the next few years, the population began to build and spread. By 2002, many trees in southeastern Michigan were dead or dying. In North America, native ash trees have little or no resistance to EAB and natural enemies have so far had little effect when EAB populations are high.
