 Foresters are drilling holes and injecting insecticides into tree trunks in Williston as a part of the effort to fight the emerald ash borer. It was first detected in Vermont back in 2018, native to China in eastern Russia. The invasive beetle burrows into trees, usually killing them in about three to five years. If an infestation is detected early enough, an insecticide can be used to treat the tree and kill the beetles.