Hot Topics: Too Many Ladybugs

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There are ladybugs and then there are ladybugs. The Asian lady bird beetle was introduced into the US to eat aphids, but as introduced species often do, they grew out of control and achieved pest status. They won’t hurt you, but they have an acrid odor and can stain your walls and fixtures yellow with their “secretions.” So when it’s fall and the Halloween Ladybeetle comes swarming, the Forum makes them fly away home.

Original Post: Asian Ladybug

qwertyjjj Member

We have a yearly problem with Asian ladybirds, which I believe were first introduced in the US to control other pests but have now become pests themselves. They like to find warm places in autumn to hibernate and end up coming in the gaps and hiding out between studs and wood in houses.
Is there any way to prevent these from coming in? I've heard about some insecticides being painted on the outside of a house but I presume this has other health consequences.

Highlights from the Thread

PAbugman Forum Topic Moderator

You will need residual insecticides; meaning they leave a chemical barrier after the water dries. It needs to be sprayed, brushed, etc into all cracks and crevices and void spaces. Window/door frames and tracks. Vents and windows in attics. Any gaps in exterior siding. Spray where soffit meets siding. Spray where siding meets foundation or the ground.

If you are really ambitious you can also seal a lot of the cracks/gaps with whatever will work.

I don’t know what brand of insecticide to recommend, but it should be a concentrate that you mix with water and use a compressed air sprayer. An aerosol can of residual insecticide can help in some areas that you can’t spray with the water-based insecticide.

If you tell us the names of the “active ingredients” that are available to you then I can tell you if I think it would work.

Some examples here in the US would be: cyfluthrin; Lambda-cyhalothrin; Bi-fenthrin;

Now is the critical time to treat.

qwertyjjj Member

Any health effects both from spraying and from living in a place with all the outside walls sprayed?

PAbugman Forum Topic Moderator

Are you allergic to insecticides/pesticides? Some people are.

Otherwise whoever applies the insecticide should follow the label carefully and there shouldn’t be any problems. The labeled directions will tell you about how long to wait until pets can go out, people, etc. Carefully read the label and material safety data sheets (MSD’s) of the insecticide that you decide on and see what you think.

photo by Mike Keeling

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