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Tree Board warns residents to watch for spongy moth and zigzag sawfly; report spongy moth to MDA
Summary
Board members raised alerts about two invasive pests—spongy moth, which can defoliate oaks, and zigzag sawfly of elm; members advised residents to contact the Minnesota Department of Agriculture about suspected spongy moth and consult a professional for aggressive zigzag sawfly cases.
During board-member updates on Jan. 20, 2026 members asked the Tree Board to notify residents about invasive pests spotted recently in the region. A board member warned that spongy moth has appeared in neighboring communities and can heavily defoliate oak trees, and said residents should report suspected spongy moth to the Minnesota Department of Agriculture (MDA).
"If you find spongy moth, you alert the Minnesota Department of Agriculture," the member said, adding that private tree companies are not supposed to handle MDA-controlled responses for spongy moth and that residents can contact the city forester or an arborist for help in notifying the MDA.
The board also discussed a recently observed elm pest, the zigzag sawfly of elm, which chews zigzag patterns through elm leaves. Members said zigzag sawfly has been seen on nursery stock and is widespread; while feeding is often cosmetic, professional treatment can be used in severe cases.
The board agreed staff would work with the forester to produce guidance and photos for the Oakdale Update and the city website so residents can recognize the pests and learn how to report or respond.
