Emerald Ash Borer


Date: August 17th, 2010


This Asian beetle, discovered in 2002 in southeastern Michigan, infests and kills North American ash species (Fraxinus sp.) including green, white, black, and blue ash.


Damage is caused by the larvae, which feed in tunnels (called galleries) in the phloem just below the bark. The serpentine galleries disrupt water and nutrient transport, causing branches, and eventually the entire tree, to die. Adult beetles leave distinctive D-shaped exit holes in the outer bark of branches and the trunk.


Adults are roughly 3/8” to 5/8” long with metallic green wing covers and a coppery red or purple abdomen. They may be present from late May through early September, but are most common in June and July.


Click here for more descriptions and pictures of emerald ash borers, or click here for an article from the NYS Department of Environmental Conservation.


Additional Resources: http://www.emeraldashborer.info/

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