The elm zigzag sawfly was spotted by researchers infesting elm trees in both Franklin and Delaware counties, according to the Ohio Department of Natural Resources.
“Elm zigzag sawfly is an invasive insect native to Asia that was first found in Canada in 2020 and in multiple eastern U.S. states in 2021 and 2022,” ODNR Division of Forestry, Forest Health Program Manager Tom Macy said in aThe invasive species is capable of “significant defoliation of elm trees,” though its overall impact to forests and urban landscapes is not fully known, according to the release.
“The Northern Research Station has conducted important research on Dutch elm disease-tolerant elm at the Delaware lab for several decades. Because we manage multiple acres of elm plantations and monitor them closely, we were able to detect this infestation of elm zigzag sawfly,” Northern Research Station Ecologist Kathleen Knight said. “Northern Research Station scientists worked with the appropriate regulatory agencies to confirm the identification of the insect and identify infested areas.
ODNR says it will continue to monitor and survey the elm zigzag sawfly across Ohio. The species’ larva is light green in color and up to one-half-inch in length. The larvae create zigzag patterns through leaves as they feed. The adults are less commonly observed and small, measuring about one-quarter of an inch in length, shiny black, and winged.
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