What Are the Red and Black Bugs on My Windows in Fall?
Red and black bugs gathering on sunny walls and windows in fall are almost always boxelder bugs. Orange beetles are Asian lady beetles. Both look for a warm place to spend winter and can slip indoors through small gaps.
Boxelder bugs
About half an inch long, black with red lines. They feed on boxelder, maple and ash seeds and gather on sun warmed walls.
Lady beetles and cluster flies
Asian lady beetles are orange to red and can leave a yellow stain. Cluster flies are slow, dull gray flies that gather in attics and upper rooms.
What helps
- Seal gaps around windows, doors and siding
- Repair screens and vent covers
- Vacuum indoors rather than crushing
- Treat the exterior in early fall
What this means in Omaha
Mature trees across Dundee, Midtown, Papillion, Bellevue and small towns make boxelder bugs a regular fall visitor in the Omaha area.
Frequently Asked Questions
Are boxelder bugs harmful?
They do not bite people or damage the house, but they can stain surfaces when crushed and are a nuisance in large numbers.
Why are they back in spring?
Those that spent winter in wall voids become active on warm days and head for the light, then move back outdoors.
Who do I call for this in Omaha?
Call 402-242-5544, open 6:00 AM to Midnight CT every day. We cover Omaha and nearby towns.