The Emerald Ash Borer (EAB) is an invasive insect native to Asia. This insect infects and kills North American ash species to include, green, white, black and blue ash trees. Since its discovery on the North American continent in 2002 originally in Michigan, it has now been seen in 12 states and two Canadian provinces. In May of 2009 the EAB has been discovered in the Twin Cities Metro Area, in particular, St. Paul. The adult beetle will eat the leaves of an ash tree causing little damage. It is the larvae (immature stage or the borer stage) that tunnels into the outside bark (what we see) of ash trees feeding on the inner bark. This inner bark transports nutrients and water between the leaves and the roots of the tree allowing it to live. Once the tree has been infected with the borer, the EAB disrupts the trees ability to transport water and nutrients from the canopy and the root system and vice versa.
What to look for:
- D-shaped exit holes (made by the adult) on the outer bark of branches and trunks
- The adult insect has metallic green wing covers and a coppery red or purple abdomen. They are about 3/8 to 5/8” long. Present from late May to early September but most common in June and July.
- A declining leaf canopy beginning in the top 1/3rd progressing until the tree bare
- Epicormic shoots-sprouts growing from roots or base of trunk and leaves larger than normal
- Increased woodpecker activity
What you should do if discovered:
Call the Minnesota Arrest-the-Pest Hotline (1-888-545-6684)
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