Spot the Difference: Ladybug and Asian Beetle

July 24, 2024 5 min read

Spot the Difference: Ladybug and Asian Beetle

What's the difference between common ladybugs and the Asian Lady Beetle(pictured above)? The many answers may surprise you! Read on to learn more about the fascinating contrasts between these often misattributed species! 

Common Ladybug

The common ladybug, also known as the ladybird beetle or lady beetle, is a beloved native species celebrated for its role as a natural predator of garden pests. With its striking red or orange elytra adorned with black spots, the ladybug is readily welcomed into gardens worldwide. These small beetles are voracious consumers of aphids, mealybugs, scale insects, and other soft-bodied pests that can damage plants and crops. Their presence in gardens helps maintain a natural balance by reducing pest populations, thus minimizing the need for chemical pesticides!

Ladybugs undergo a complete metamorphosis, starting as eggs laid near aphid colonies or other prey. The larvae hatch and immediately begin feeding on pests before pupating and emerging as adults. Their ability to consume large quantities of aphids and other pests makes them invaluable allies in integrated pest management strategies for both home gardens and agricultural settings. Beyond their practical benefits, ladybugs are also appreciated for their aesthetic appeal and symbolic significance, often considered bringers of good luck in many cultures around the globe!

Asian Lady Beetle

The Asian lady beetle, Harmonia axyridis, was originally introduced into the United States around 1916 as a biological control agent to manage aphid populations in agricultural settings. However, it wasn't until 1988 that these beetles became established in North America, particularly in the southeastern United States. Since then, Asian lady beetles have rapidly spread across the continent, becoming an invasive species with significant ecological and economic impacts.

Asian lady beetles are similar in appearance to native ladybugs but exhibit more variable coloration, ranging from orange to red, and can have varying numbers of black spots on their elytra. Unlike native ladybugs, Asian lady beetles are more aggressive and can outcompete native species for resources. They are also known for their habit of seeking shelter indoors during the fall months, which can lead to nuisance issues as they accumulate in large numbers inside homes and other structures. Efforts to manage and control Asian lady beetle populations include monitoring their spread, studying their ecological impacts, and implementing pest management strategies to mitigate their effects on both native ecosystems and human habitats.

Ladybugs vs Asian Lady Beetles: Spot the Difference

Asian lady beetles (Harmonia axyridis) and common ladybugs (generally species in the Coccinellidae family) share some similarities in their general appearance but also exhibit distinct physical characteristics. Both species typically have rounded bodies with elytra (wing covers) that can range in color from yellow to orange to red, often adorned with black spots. However, Asian lady beetles tend to have more variable coloration and markings compared to the more consistent red with black spots seen in many common ladybug species. Some Asian lady beetles may have fewer spots or no spots at all, and their elytra can be orange with black spots or even black with red spots, making their identification more diverse.

In terms of size, Asian lady beetles are generally larger than most common ladybugs. They can range from about 5 to 8 millimeters in length, whereas common ladybugs typically range from 5 to 7 millimeters. Anatomically, both species have similar structures, including mouthparts adapted for feeding on aphids and other soft-bodied insects. However, Asian lady beetles have slightly different antenna structures compared to many native ladybugs. 

Behavioral Differences Between Ladybugs and Asian Lady Beetles

Ladybugs (Coccinellidae species) and Asian lady beetles (Harmonia axyridis) exhibit notable behavioral differences that reflect their ecological adaptations and interactions with their environments. Ladybugs are generally known for their gentle and non-aggressive behavior towards humans and other organisms. They primarily feed on soft-bodied insects like aphids and scale insects, using their mouthparts to pierce and suck out their prey's fluids. Ladybugs are beneficial in gardens and agricultural settings, where they help control pest populations without causing harm to plants or humans. During colder months, some ladybug species may overwinter in sheltered locations such as leaf litter or crevices in trees or rocks, where they enter a state of dormancy until warmer temperatures return.

In contrast, Asian lady beetles exhibit more variable behaviors that can include aggression and biting under certain circumstances. While they are also beneficial predators of aphids and other pests, Asian lady beetles have been known to bite humans, though this behavior is typically defensive and occurs when they feel threatened or trapped. This biting behavior, along with their tendency to aggregate in large numbers indoors during the fall months for overwintering, can lead to nuisance issues in residential and commercial buildings. Asian lady beetles are more adaptable to a range of habitats and environmental conditions, contributing to their success as an invasive species in North America.

Are Asian Lady Beetles Harmful to Plants?

Asian lady beetles can potentially harm plants, especially when present in large numbers. While these beetles primarily feed on aphids and other soft-bodied insects, their sheer abundance can lead to indirect damage. Their feeding behavior, though beneficial in controlling pest populations, can sometimes lead to minor damage to plant tissues as they search for prey. Their tendency to seek shelter indoors during colder months can also be a nuisance, as they may inadvertently damage ornamental plants or crops if they aggregate in gardens or agricultural settings.

Are Asian Lady Beetles Harmful to Ladybugs?

Asian lady beetles (Harmonia axyridis) pose several threats to common ladybugs (Coccinellidae species) when they coexist in the same habitats. One significant threat is direct competition for resources such as food and overwintering sites. Asian lady beetles are known for their aggressive behavior, often outcompeting native ladybugs for prey like aphids and other soft-bodied insects. This competition can reduce the available food sources for common ladybugs, potentially impacting their survival and reproductive success.

Another concern is the transmission of microsporidian parasites, specifically Nosema spp., by Asian lady beetles. These parasites can infect and weaken native ladybugs, affecting their health and ability to reproduce. Furthermore, Asian lady beetles are generally more adaptable to a wide range of environmental conditions and habitats compared to many native ladybugs, giving them a competitive edge in colonizing and occupying shared ecosystems.

How to Get Rid of Asian Lady Beetles

Asian Lady Beetles are notable for their tendency to swarm in large numbers, especially during the fall months when they seek shelter for overwintering. They are attracted to light and warmth, often congregating on sunny walls, windows, and doors of buildings. This behavior frequently leads to them inadvertently entering homes and other structures in search of protected spaces to survive the winter. 

To ensure these pests are removed from your home:

  • Use a vacuum to remove Asian Lady Beetles from inside your home
  • Spray citrus oil or citronella to repel Asian Lady Beetles
  • Turn outside lights off at night
  • Seal cracks around doors, siding, windows, screens, etc.
  • Trim vegetation around the perimeter of your home

Explore Ladybug Metamorphosis with Insect Lore

Now that you know the difference between beneficial Ladybugs and invasive Asian Lady Beetles, continue your insect adventure! Explore our Ladybug Kits!


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