Ladybugs, recognized by their distinctive dome-shaped bodies and bright colors, typically red or orange with black spots, are welcomed in gardens. They serve as natural pest controllers, consuming aphids and other small, soft-bodied insects that can harm plants.
Do Ladybugs Bite?
Ladybugs possess mandibles and can bite humans. Bites from native ladybug species are uncommon, usually occurring only if the insect feels threatened or is handled roughly. When a bite happens, it is generally a mild pinch or pinprick sensation, rarely breaking the skin. The experience is typically more surprising than painful.
Reasons for a Ladybug Bite
A ladybug might bite for a few reasons, though it is not an act of aggression. They may mistake human skin for a food source, such as an aphid, or explore their surroundings with mouthparts. In some cases, particularly during dry conditions or when usual food sources are scarce, ladybugs might attempt to seek moisture or salt from human skin. This behavior is more exploratory or defensive rather than a deliberate attack.
What to Do After a Bite
If a ladybug bites, clean the affected area thoroughly with mild soap and water. This helps remove any potential irritants and reduces the minimal risk of infection. Applying a cold compress can help alleviate any minor irritation or swelling. Over-the-counter antihistamine creams can also be used if there is itching or discomfort. Most ladybug bites are harmless and do not require medical intervention, but in rare instances of severe allergic reactions, such as significant swelling, widespread rash, or difficulty breathing, medical attention should be sought.
Ladybugs Versus Look-Alikes
Many reported “ladybug bites” come from the Asian lady beetle (Harmonia axyridis). Introduced to North America and Europe for pest control, these beetles are more common and prone to biting humans than native ladybugs.
Distinguishing between native ladybugs and Asian lady beetles involves visual cues. Native ladybugs are typically rounder, vibrant red with symmetrical black spots. Asian lady beetles range from light orange to reddish-orange and are often more oval. A key feature of the Asian lady beetle is a distinct black “M” or “W” shaped marking on the white area behind its head.
Unlike native ladybugs, Asian lady beetles congregate in large numbers, especially indoors during cooler months. They can also emit a foul-smelling, yellowish fluid when disturbed, which may stain surfaces.