Stingless wasps to be released in Winona County to fight ash borers

The wasps will be released in Great River Bluffs State Park in Winona County, where a recent borer infestation was reported. The state has released the wasps on four separate occasions since the pest was first discovered in 2009.
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The wasps will be released in Great River Bluffs State Park in Winona County, where a recent borer infestation was reported. The state has released the wasps on four separate occasions since the pest was first discovered in 2009.

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