The elm zigzag sawfly (Aproceros leucopoda) is now established in several places in North America. This non-native forest pest can be a threat to elm species and hybrids and is capable of large defoliation events. Early instar larvae make a zigzag pattern as they feed from the edge of the leaf toward the midrib, creating unmistakable feeding damage that can be relatively easily identified. A new review highlights elm zigzag sawfly biology, ecology, and management strategies in the U.S. (Image by Matthew Bertone, Ph.D. [left], and Eric Day, Ph.D. [right], originally published in Oten et al 2023, Journal of Integrated Pest Management)