Zigzagging menace: Invasive sawfly discovered at Forest Service research lab
Elm zigzag sawfly larvae emerge from eggs laid on the edge of elm leaves and begin feeding in a telltale, zigzag pattern. (USDA Forest Service photo by Kirsten Lehtoma)
OHIO—A sharp eye at a Forest Service Northern Research Station lab in Delaware, Ohio, made a surprising discovery in July 2023. On an…