First records of elm zigzag sawfly (Hymenoptera: Argidae) in the United States

Abstract The elm zigzag sawfly (EZS), Aproceros leucopoda Takeuchi, was detected in the United States for first time Virginia 2021. In 2022, it confirmed 4 additional states: Pennsylvania, North Carolina, Maryland, and New York. These are records of this species demonstrate a rapid range expansion an invasive defoliating pest. Native to Asia, EZS feeds exclusively on Ulmus spp. (elms; Ulmaceae). States, feeding damage ranges severity from minor severe. Young instars create zigzag-shaped pattern leaves as they feed, while older larvae feed more completely foliage, leaving only midvein sometimes thick lateral veins. This complete often obscures signature defoliation younger instars. Long-term health impacts host trees unknown, though aesthetic damage, growth loss, branch dieback occur Europe where is also invasive. Little known about management options pest, continued species’ expected.