UNDATED (WJON News) -- A group of state and federal agencies is wrapping up an effort this month to slow the spread of emerald ash borer in the Chippewa National Forest. The Minnesota Department of Natural Resources, the Minnesota Department of Agriculture, and the U.S. Forest Service are implementing what's called the "parasitoid wasp program". The agencies release three species of non-stinging wasps to target EAB at different life stages. This year, the agencies released 5,424 wasps across 200 acres of the Chippewa National Forest. There are now 59 Minnesota counties known to have emerald ash borer infestations.