To kill Asian lady beetles, spray outdoors using pesticides such as Demand or Demon WP and vacuum any beetles that enter the home. Prevention is the best method for dealing with Asian lady beetles, so spray regularly and seal any cracks through which lady beetles might enter the house.
The Asian lady beetle varies in color from orange to red. It displays black spots and an M-shaped marking behind its head. Infestations of lady beetles usually begin in late September when the beetles are looking for places to overwinter.
Asian lady beetles do not infest wood or destroy property and clothing, but they do bite humans. They also emit a strong smell when threatened due to a defense mechanism called reflex bleeding, in which an insect leaks out a noxious fluid to warn predators. The fluid from lady beetles stains light surfaces and has a foul odor.
Lady beetles can fit through spaces that are one-eighth of an inch in size, so seal up gaps and cracks before September. Repair door screens and use rubber seals along the bottoms of doors to prevent lady beetles from entering the home.
Chemical pesticides are useful for killing outdoor lady beetles. Choose pesticides that contain chemicals such as bifenthrin, cypermethrin and permethrin. If lady beetles get inside, use a vacuum cleaner to capture and dispose of them. Pesticides are of no use indoors, because lady beetles can escape through holes in the walls and emerge again at any time.