UNH Extension offers advice on what to do about infestation of Asian ladybugs

In 1994 a new ladybug appeared in New Hampshire. Known to scientist as Harmonia axyridis (Pallas), this insect is now common in all of the New England states. Scientists believe these insects reached the United States as stowaways on ships. The first U.S. discovery was in the New Orleans area in 1988. It’s most rapid spread was to the northeast, possibly arriving in New Hampshire in the fall of 1993.

This insect is very beneficial as a predator of aphids and other small soft bodied insects such as whiteflies. We find it commonly in corn fields, crops of melons, peppers and tomatoes, where it helps to protect these crops against insect pest. The Asian lady beetle and its larvae spend a lot of time in trees. We commonly find them in apple orchards as well as in ornamental trees such as tulip trees.

This insect can also be nuisance. In the fall large numbers may gather on the outside of buildings as they search for suitable over wintering sites. When one beetle finds conditions that are suitable, it fives off a chemical signal, called a pheromone,

If lady beetles invade your home, sweep or vacuum them up and take them outside. There are no repellents to make the insects leave. We do not recommend controlling them by spraying insecticide on or inside building.

If you would like a fact sheet on “Asian Ladybug” please call the Belknap County UNH Extension at 527-5475.