Identifying Ladybugs – Asian Vs. Native Lady Beetles

There are approximately 5,000 species of lady beetles worldwide. While most species are considered beneficial, the Asian lady beetle has earned a reputation as a nuisance bug. This non-native species invades homes and businesses in large swarms from September through November. Identifying ladybugs and understanding the behavioral differences between lady beetles can help gardeners control unwanted populations of Asian lady beetles. Asian Lady Beetle Characteristics The harlequin or multicolored Asian lady beetle (Harmonia axyridis) has its origins in Asia, but these bugs are now found worldwide. Like other species of ladybugs, the Asian lady beetle feeds upon aphids and other garden pests. When comparing Asian vs. native lady beetle behavior, the major difference is native ladybugs overwinter outdoors. While it’s easy to think Asian lady beetles come inside to escape the cold, studies have shown they are attracted to contrasting vertical stripes similar to the markings seen on rock cliffs.

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