Asian ladybird beetle multicolored Asian lady beetle

Harmonia axyridis Adults are about 6 mm long. Body color pattern varies from yellowish orange to nearly red, and the elytra can have none to more than 20 spots. Adults live several years and their color may change during this time. Larvae are elongate, somewhat flattened, and covered with small tubercles and spines. Eggs are deposited in batches ofabout 20 on the underside of tree leaves; hatching occurs in 3-5 days. Larval development is completed in 12-14 days. The pupa is attached to the leaf surface, and adults emerge in 5-6 days. There are two or three generations per year, and adults live 2-3 years. In the first generation, following the overwintering ofadults, all females are reproductive; in the second generation a few females enter diapause; in the third and possibly fourth generation most females are in diapause. Adult beetles use visual and olfactory cues to locate a suitable overwintering site. These locations are usually in the sun and warmer than adjacent sites. Once at the overwintering site, beetles apparently use chemical cues to locate a harborage. The source ofchemical cues might be beetle feces from the previous year, the odor of beetles that died at the site the previous year, or an aggregation pheromone. Adults are capable flyers and are attracted to natural and ultraviolet light indoors.

This beetle has been released in many regions of the world as a biological control agentfor pestaphids. Itwas introduced from eastern Asia to eastern North America by the US Department of Agriculture in 1977,1978,1980, and 1981. The adults and larvae inhabit various trees, including maples, walnut, willow, and oak. They feed on aphids, scale insects, and other soft-bodiedinsects.Ithasbeeneffectiveinreducingpestpopu-lations ofaphids in pecan orchards.

Several species of flies are known to parasitize H. axyridis, including the phoridfly, Phalacrotophoraphilaxyridis. This pupal parasite has been recorded from Japan, and is probably distributed wherever the Asian ladybird beetle is found.

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