Asian Lady Beetles in Indiana, Illinois and Kentucky
Originally introduced from Asia between 1978 and 1981, the multicolored Asian lady beetle was intended as a natural control against crop-damaging pests like aphids and scale. Over time, it spread throughout the United States and became firmly established. During fall, these beetles often gather indoors in significant numbers, turning from beneficial allies in the field to unwelcome invaders in houses.
Asian Lady Beetle Habitat
With an appetite for crop pests and the ability to produce multiple generations per year, this beetle thrives in agricultural areas. Yet, its tendency to form large clusters and seek shelter in buildings creates a significant pest issue. Homeowners have reported seeing hundreds, even thousands, gathering indoors and on exterior walls. They are often spotted in attics, wall voids, closets, and on siding, and are sometimes drawn toward light sources. This behavior often leads to frustration during cooler months.
Asian Lady Beetle Behaviors, Threats, or Dangers
Swarming is one of the standout behaviors of Asian lady beetles, most often seen during the fall. In search of warmth, they gather in large numbers and slip indoors through cracks and gaps. While they don’t bite or spread disease, their abundance alone makes them a nuisance. Adding to the problem, they can exude a yellow fluid that both stains and smells when they are crushed.
Frequently Asked Questions
What Does an Asian Beetle Look Like?
Asian lady beetles are small, round insects with slightly domed bodies, usually measuring between 1/4 and 3/8 inches long. Their colors range from orange to red, and the number of spots can vary. A key identifier is the distinctive “M”-shaped mark found on the head.
Are Asian Lady Beetles Harmful?
Asian lady beetles generally pose no danger to humans or pets. They are actually beneficial in gardens and farms because they feed on pests like aphids and scale insects. The main issue arises when they enter homes in large numbers, which can be frustrating. A licensed beetle exterminator can safely and effectively remove them.
Do Asian Lady Beetles Bite?
While Asian lady beetles can bite, their bites are minor and do not spread disease. If handled or crushed, they release a strong odor and may leave a stain.
What Are Asian Lady Beetles Good For?
Asian ladybugs are beneficial for gardens and crops because they feed on aphids and other soft-bodied pests, helping to naturally control harmful insect populations.
What Do Asian Lady Beetles Eat?
Their diet mainly consists of aphids and other small insects, making them valuable predators in gardens and agricultural areas. They may also consume nectar, honeydew, or other sugary substances for energy.
Are Asian Ladybugs Invasive?
Yes, Asian ladybugs are considered invasive in many areas. Originally introduced to North America for pest control, they reproduce quickly and compete with native species, sometimes disrupting local ecosystems.
How Do You Get Rid of Asian Lady Beetles?
In the fall, these beetles look for warm, protected spaces such as attics, wall cavities, door frame cracks, soffits, and other crevices to overwinter. If large numbers enter homes, they can leave stains on clothing and drapes. Although they cannot survive sub-freezing outdoor temperatures, they thrive indoors where warmth and humidity are present. For infestations, it’s best to contact a licensed beetle exterminator.
What Is the Difference Between a Ladybug and an Asian Lady Beetle?
Telling a common ladybug apart from an Asian lady beetle can be tricky. Asian lady beetles often have an “M” or “W”-shaped mark on their heads and display a wider variety of colors and spot patterns. In contrast, common ladybugs are usually uniformly red with black spots.
