Ralph Frazier, Pollet, Dale K.
Preventing lady beetles from entering your home is the best approach to keeping them from becoming a household nuisance in fall and winter. Caulking exterior cracks and crevices--before the lady beetles seek overwintering sites-- is the best way to keep them out. This will also keep out other unwanted insects, such as wasps, and will save homeowners money on energy costs.
Lady beetles that enter wall spaces in the fall may remain there, without entering living areas, until they depart in spring to search for food. But some may become active on warm days in late winter or early spring and move into living areas.
Sweeping and vacuuming are effective methods for removing these lady beetles from living areas. Using insecticides indoors for control of the lady beetles is not typically recommended unless the infestation is very heavy; at that point, professional pest control advice should be sought.
Lady beetles that enter living areas are typically attracted to light. A trap for indoor use that uses light to attract lady beetles and other flying insects was developed by retired entomologist Louis Tedders and colleagues at the Southeastern Fruit and Tree Nut Research Laboratory, Agricultural Research Service in Byron, Ga. The insects become trapped in a removable bag. Use of insecticides is unnecessary. A patent application was filed, but a patent was not granted.
Detailed technical instructions and diagrams for constructing the trap are available through the link below.
The LSU AgCenter and the LSU College of Agriculture