Updated: Sep 16, 2023 / 06:02 AM HST DELAWARE, Ohio (WCMH) – An invasive insect known for leaving unique patterns on the leaves of elm trees has been spreading this summer.

Updated: Sep 16, 2023 / 12:02 PM EDT DELAWARE, Ohio (WCMH) – An invasive insect known for leaving unique patterns on the leaves of elm trees has been spreading this summer.

Its telltale trait, though, is its feeding pattern. As seen in the image above, the elm zigzag sawfly is known to eat the leaves of an elm tree in a zigzag path.

Its telltale trait, though, is its feeding pattern. As seen in the image above, the elm zigzag sawfly is known to eat the leaves of an elm tree in a zigzag path.