Elm sawfly (elm leafminer sawfly)

Woodlands, parks, gardens, and edges where elm, willow, and related trees grow. Adults often rest on trunks, fences, or vegetation.

Larvae feed on elm, willow, and other broadleaf foliage. Adults primarily consume nectar or may feed little.

Adults are large, slow-flying sawflies active mainly in late spring and summer. Females insert eggs into leaves; caterpillar-like larvae later drop to soil to pupate.

They do not sting and are generally harmless to people, though larvae can defoliate trees locally. They contribute to food webs and may be minor pollinators as adults.