08/25/2025
Recently, we’ve had a few clients reach out asking what these were, and if they pose a threat.
These are Mayflies. Most of their lives are spent underwater as nymphs. When they begin to fully grow wings after the imago(adult) phase, they emerge in large, synchronized swarms and sometimes cause concern.
However, they pose no real threat to humans. They don’t bite, spread disease, and have a relatively short lifespan.
They are attracted to large bodies of water, and usually begin to hatch when we get hot weather + high humidity. They are also be attracted to lights(porch lights, street lamps, & windows).
If you see these, it doesn’t require a professional’s help. They will usually go away on their own. Reducing the conducive conditions mentioned above will help prevent a future swarm.
Robert Schmidt
909.257.9708