Foresters hope wasps rid area of emerald ash borer beetle

Mark Speckan, forestry crew chief for the Lake County Forest Preserve, releases one of two species of wasps onto ash trees in the Sedge Meadow Forest Preserve near Wadsworth on Thursday, Sept. 29, 2011. The goal of releasing the wasps is to protect the trees against the Emerald Ash Borer. The... Keri Wiginton/ Chicago Tribune
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