Identifying Seasonal Insect Swarms Near Hickory Trees

Observation

Tiny, fruit fly-like insects appear each June for a few days in a Niagara Falls backyard. The neighbor's hickory drops leaves with knot-like galls containing hundreds of the insects.

Likely Cause

The galls are likely formed by gall midges or aphids specific to hickory. The brief emergence coincides with adult insect emergence from galls. These insects are typically host-specific and do not infest other plants or structures.

Recommendation

Consult a local entomologist or extension service for precise identification and advice. Most such seasonal emergences are harmless and require no control. Tolerance and exclusion (screens) are practical responses.