Multicolored Asian Lady Beetle Invasion

multicolored Asian lady beetle
Multicolored Asian lady beetle
Gyorgy Csoka, Hungary Forest Research Institute,

J. McLeod Scott
Home & Garden Information Center

As the weather cools in South Carolina in October and November, lady beetles (ladybugs), especially multicolored Asian lady beetles (Harmonia axyridis), can often be found congregating on the outsides of buildings and homes, especially on the sunny south and west sides of buildings. These insects are looking for shelter to survive the approaching cold of winter. In pursuing this effort, they will sometimes enter homes and other buildings. Once adults find a location that appears to be a suitable overwintering site, they release a chemical, called a pheromone. The chemical attracts other multicolored Asian lady beetles, which may arrive in very large numbers.

While lady beetles do not carry disease and do not reproduce indoors, their sheer numbers can make them an irritating nuisance. To learn more about lady beetles and their seasonal invasion of homes as well as how to prevent them from entering your home and what to do if they make it inside despite your best efforts, see EIIS/HS-15, Seasonal Invaders and EIIS/HS-3, Multicolored Asian Lady Beetles.

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This information is supplied with the understanding that no discrimination is intended and no endorsement by the Clemson University Cooperative Extension Service is implied. All recommendations are for South Carolina conditions and may not apply to other areas. Use pesticides only according to the directions on the label. All recommendations for pesticide use are for South Carolina only and were legal at the time of publication, but the status of registration and use patterns are subject to change by action of state and federal regulatory agencies. Follow all directions, precautions and restrictions that are listed.