You may want to check out the attached PDF of an article written by plant pathologist Katharine D. Widin in the May/June 2008 issue of Northern Gardener. As you may know, the presence of EAB in St. Paul was confirmed last week. Experts like Kathy, who is the magazine’s regular contributor on plant health issues and runs her own company helping individuals and organizations deal with pests, rots, diseases and other plant issues, have been expecting to find the borer here for awhile. The article describes the history of the EAB infestation in North America, tells how to spot an infestation and what to do about it, and includes pictures of both the borer and the galleries that it leaves in trees that have been infested.
For more information on this issue, check out the state site on Emerald Ash Borer.