When I hear the phrase “trap tree,” an image of Charlie Brown’s kite-eating tree in the Peanuts comic strip comes immediately to mind. But trap trees, or sentinel trees, are meant to nab a much smaller flying object, the emerald ash borer (EAB).
The idea is to make certain ash trees more attractive to EAB, to serve both as a monitoring tool and as a means of slowing the rate of ash death. Early in the growing season, a chosen ash tree is girdled, which stresses it and induces it to create certain phenols and alcohols not present in healthy trees. It is on this chemical signature that the adult emerald ash borers home in. » Continue Reading.