Stingless wasps: How much do they help in the fight to save ash trees?

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Great River Bluffs State Park, Minn. — It’s been three years since state and federal officials first released thousands of tiny stingless wasps on an island in the Mississippi River to combat the destructive emerald ash borer.

Now, researchers are using a new technique at one state park in southeastern Minnesota to measure the effectiveness of the wasps.

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