News Animals

An all-female wasp is rapidly spreading across North America’s elms

The elm zigzag sawfly is spreading fast. Now it targets trees planted to replace diseased elms

A close-up photo shows a black sawfly perched on the edge of a green leaf, with its wings folded along its body.

Originally from East Asia, the elm zigzag sawfly has expanded its range across North America at a rate that alarms biologists

jobangles/iNaturalist

By Ute Eberle

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