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Emerald Ash Borer: Signs and Symptoms

July 24, 2013

Weekly ag column Mike Boersma County Extension Educator with the U of M Extension Service in Murray and Pipestone
In 2009, the presence of Emerald Ash Borer (EAB) was confirmed in extreme southeast Minnesota and also within the Twin Cities metro area. Many experts agree that it is only a matter of time before EAB findings spread to other parts of Minnesota. While EAB is not capable of moving across the state very rapidly on its own, the possibility of the insect eventually finding its way to western Minnesota is fairly high. The discovery of EAB would have drastic and lasting effects on the area's ash tree population.

What is EAB? The Emerald Ash Borer is a small, metallic green insect that attacks and kills several species of ash trees. The adult insects lay eggs in the cracks of the bark of host trees. The larvae create elaborate tunnels underneath the bark, cutting off the plant's supply of water and nutrients. Once mature, the adult insects emerge; leaving D shaped exit holes on the exterior of the tree.

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