The trees in Colorado are under threat. They are in danger of succumbing to the same invader that is felling ash trees around the country: the invasive emerald ash borer. Things are desperate enough that Colorado is now using fire to fight fire — a predator wasp from China has just been unleashed in Boulder in the hopes that this foreign species will destroy the other, reports Bruce Finley for The Denver Post.
The ash borers, with their jewel-like green carapaces, also hail from Asia. The first reports in the U.S. started rolling in from the Midwest in 2002, but the insect probably arrived in North America through packing crates sometime in the late 1990s. The larvae live beneath bark and snack on the tree’s tender, living tissues, slowly killing the tree from the inside out. In its native range, resistant trees and predators keep the beetle in check. In North America the beetles run rampant, killing nearly all trees after just six years in an area.
The wasp, Oobius agrili, is one of the predators that keeps the beetle at bay in Asia. It lays its eggs on the beetle's eggs. Once they hatch, wasp larvae eat the baby beetles before they can emerge. But researchers don’t know yet if the wasp release in Boulder will work. "This is an experiment. We hope it is enough and that the wasps will establish themselves. The idea is they will reproduce on their own," John Kaltenbach with state Department of Agriculture told Finley. The experts hope that the wasp will survive the winter and then work to save the estimated 1.45 million ash trees in the Denver metro area.
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