Forest Service scientists are piloting parasitic wasps to control populations of emerald ash borer, a pest that’s decimating ash trees. These trees once shaded streets and forests alike. Predatory wasps — which, like the borer, hail from eastern Asia — lay eggs inside the beetles. When hatched, the larvae burst from and kill their hosts. Researchers propose these wasps may complement other borer-control techniques, like applying insecticide and breeding resistant trees.  CLICK HERE for more info.