It’s that time of year again when the Asian Lady Beetles are seeking a place to spend the winter. They are congregating on the sun-warmed sides of buildings and homes looking for a protected site or tiny opening to crawl inside to a warm and dry place, out of the coming cold. They overwinter as adults in a dormant state, not eating, drinking, mating or laying eggs. They are not doing any damage to the house, just using it like a bear uses a cave for the winter. Once they are inside, some are fooled by the artificial environment we create by lighting our home during the night hours and heating when it is cold outside, to come out of their winter rest early, becoming a nuisance inside.
Their spots and coloring will vary, but they will also have the same ‘M’ mark in black on their head.
They are annoying to share living space with them. Keep them out of your house by keeping screens in screen doors in good repair. Caulk or seal up any cracks or crevices allowing access for them to crawl inside. Screen attic vents and fan covers to exclude lady beetles from attics and air inlets. Pesticides are not warranted for them as they are considered beneficial. Vacuum up any that do make their way into the home.
Other insects that have the same habit of trying to get enter buildings to overwinter in their adult stage are stinkbugs, boxelder bugs and leaf-footed bugs. Control measures are the same as for the lady beetles.