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Cottage Grove officials have begun discussions on how to protect the almost 4,000 ash trees in public right-of-way and city parks from the destructive emerald ash borer. The invasive beetle, which began its spread in Michigan, is now killing ash trees as close as St. Paul.

Tiny green menace threatens city trees

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It's green. It's mean. And it's heading south Washington County's way.

The emerald ash borer, an invasive Asian beetle that has killed millions of ash trees from Virginia to Wisconsin, is bearing down on the Twin Cities, threatening to devastate the popular boulevard tree that lines streets and shades back yards across the Midwest.


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