A wet-dry vacuum works quite will for this. If entry points are still available, there may seem to be little reduction as new beetles enter. Vacuuming the clusters from walls during fall may also offer some relief. Insecticides are not recommended as lady beetle carcasses will remain in wall voids where other insects, such as carpet beetles, will eat them. Upon depletion of this food source, the carpet beetles move readily into the home and feed on carpets, clothes, linens, stored food products, and many other items.
Carpet beetles are extremely difficult to eliminate from a building.
Lady beetles eventually move outside to locate their natural prey in late spring. They do not feed on structural wood or stored food products. They do produce an offensive odor for repelling predators, but it does not affect humans. In Georgia, pecan growers deliberately spread Harmonia axyridis larvae and adults in the orchards to control aphids, thus greatly reducing reliance on insecticides. In our area, we might see a decline in aphid, mite and scale insects infesting ornamental trees and shrubs.