A New Invasive Zigzagging Across North America

Elm zigzag sawfly damage

There’s a new invasive insect zigzagging its way across North America. First reported by citizen scientists in Quebec in 2020, the elm zigzag sawfly (Aproceros leucopoda) has now spread to North Carolina, Virginia, Maryland, Ohio, Pennsylvania, New York, Massachusetts, and Vermont. This new pest, which is native to Asia, has the potential to cause major devastation to one of our native tree species.

Invasive Insect Elm Zigzag Sawfly Confirmed in Vermont

Elm zigzag sawfly damage

The invasive insect known as Elm zigzag sawfly (EZS) has been confirmed for the first time in Vermont. After receiving a report of potential EZS activity in northwestern Vermont, staff from both the Forest Health program of the Department of Forests, Parks, and Recreation (FPR) and Plant Health program of the Agency of Agriculture, Food, and Markets (AAFM), collected larval samples from affected elm foliage in May 2023.  Samples were sent to the US Department of Agriculture Plant Protection and Quarantine program for identification, and EZS has now been officially confirmed within the state.