Emerald ash borer invasion creeps toward Winona - KTTC Rochester, Austin, Mason City News, Weather and Sports

Emerald ash borer invasion creeps toward Winona


WINONA, Minn. (KTTC) -- There's an invasion making its way toward Winona, and it's the emerald ash borer.  The intrusive Asian insect has no known predators in the region, and is heading toward Winona one damaged ash tree at a time.

The latest discovery came on private land along County Road 17, halfway between I-90 and Winona.

The green menace is no larger than a penny, but tunnels under the bark of the tree and cuts off the tree's circulation eventually killing it.

This recent find is the closest to the city the pest has been spotted.  It is traveling from Nodine and the Great River Bluffs State Park.

There are a few signs of ash borers to look out for.

"Decline of the trees, so some of the branches in the upper canopy are not growing very well. Then, starting to look for some of the exit holes that emerald ash bore leave, and what they leave is not a round hole, but rather a D-shaped hole. Look for the damage underneath the bark that it will leave by that D-shaped hole. It will leave a kind of serpentine or S-shaped gallery underneath," says Jake Overgaard of environmental services.

If you have seen any of those signs, and think your ash trees may be at risk, you can contact the Arrest the Pest Hotline at 1-888-545-6684.

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