Clover Mite Identification Guide
Clover mites (Bryobia praetiosa) are the tiny bright red or reddish-brown arachnids that appear by the thousands on sunny windowsills, walls, and siding in spring and fall. They are NOT blood-sucking — they feed exclusively on plants. They do not bite humans, do not carry disease, and cannot survive indoors. However, crushing them leaves a red stain on curtains and walls.
Low concern
| Quick ID Reference |
|---|
| Size | Less than 1mm — tiny |
| Color | Bright red to reddish-brown |
| Legs | 8 (arachnid, not insect); front legs very long |
| Habitat | Sunny exterior walls, windowsills, concrete |
| Season | Spring and fall, especially after mild weather |
| Danger | None — stains if crushed |
Frequently Asked Questions
Are clover mites bed bugs?
No. Clover mites are much smaller than bed bugs (under 1mm vs 5-7mm), bright red, and found on windowsills and exterior walls — not on mattresses. They do not feed on blood.
Why do I suddenly have tiny red bugs on my window?
Clover mites migrate in spring and fall when outdoor temperatures shift. They move toward warm structures and accumulate on south- and west-facing windows and walls. Lush lawns and dense vegetation against your foundation encourage them.
How do I get rid of clover mites?
Do NOT crush them — they stain. Vacuum them up with a hose attachment. Create a plant-free, 18–24 inch gravel or mulch barrier around your foundation. Acaricide spray on exterior walls and around windows in early spring and fall prevents entry.
When should I call a pest control professional?
If you're seeing large numbers, finding entry points you can't seal, or if the infestation is affecting your quality of life, City Best Pest Control offers free inspections for Philadelphia, Montgomery County, Delaware County, and Bucks County residents. Contact us here.
