The jagged trail created as the insect eats gives the elm zigzag sawfly its name. Photo courtesy Gyorgy Csoka, Hungary Forest Research Institute, Bugwood.org The elm zigzag sawfly (Aproceros leucopoda), an exotic insect pest, has been found this summer in Allegany County and is spreading rapidly through New York State. The elm zigzag sawfly is an insect that eats only elm leaves and can cause severe defoliation (leaf loss) that threatens tree health. It was first detected in August 2022…
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