Orange Ladybug: What It Is, Is It Poisonous, and What to Do

What is an orange ladybug?

In the US, an orange ladybug is usually the multicolored Asian lady beetle, Harmonia axyridis. It is about 1/4 to 1/3 inch (5 to 8 mm) long, dome-shaped, and yellow-orange to red with 0 to 19 black spots. The sign that settles it is a black M or W on the white plate behind the head.

People also call it the Asian beetle, the Japanese ladybug, the harlequin ladybird or the Halloween beetle. These are all the same insect. Despite the name, it is not the Japanese beetle, a metallic green and copper garden pest. It is a true lady beetle, in the same family (Coccinellidae) as the ladybugs in picture books. However, it came from Asia, and it is the one that moves into houses.

The first US releases were in California in 1916, to fight aphids on pecans, according to a 2003 review by R. L. Koch in the Journal of Insect Science. Several more releases followed through the early 1980s. Then, in 1988, the first population known to survive in the wild was found in Louisiana, says University of Kentucky Entomology. By 1994 it had spread from Florida to Canada and from coast to coast, according to UF/IFAS.

Why so many ladybugs are orange

The most common orange ladybug is orange because the Asian lady beetle is. The species has more than 100 colour forms worldwide, says UC IPM. In North America, though, the dark forms are rare, as Koch noted. A 2020 study by Honěk and colleagues found American populations made up of the light forms: yellow-orange to red, with or without spots.

The bright colour is a warning to birds. Lady beetles carry bitter chemicals called alkaloids in their blood. In the Asian lady beetle, the main one is named harmonine. A 2007 study by Bezzerides and colleagues, using beetles from New York, found that beetles with more red and less black on their backs carried more of it. Nevertheless, the shade of red itself did not predict how much.

Age plays a part too. A lady beetle that has just left its pupa is soft and pale yellow, with faint or no spots. UC ANR’s Bug Squad watched the spots on a newly emerged beetle begin to show within about 15 minutes. So a very pale one on a leaf in summer may simply be new.

The “orange ladybird” Google shows you is not American

Search for orange ladybug, and the top result may be Halyzia sedecimguttata, the orange ladybird. That is a real species: pale orange, about 6 mm long, with 14 to 16 white spots, and it eats mildew on sycamore and ash, says the Wildlife Trusts. However, it lives in Europe and Asia. We found no North American record of it, and BugGuide, which tracks North American insects, has no entry for its genus. If you are in the US, it is almost certainly not your beetle.

How to tell which orange ladybug you have

Look behind the head first. A black M or W on a white plate means the Asian lady beetle, the one that moves indoors for winter. If there is no M, count the spots and check the plate again. The table covers the 6 orange lady beetle groups you are likely to meet in the US, and the one feature that separates each.

Sizes from UC IPM, Koch 2003, BugGuide, Vermont Atlas of Life, Cornell IPM and UConn. Inch figures for the last four rows are our conversions from millimetres.

Multicolored Asian lady beetle: the M behind the head

Between the head and the wing covers sits a small plate called the pronotum. On the Asian lady beetle it is whitish, with a black mark shaped like an M, or a W if you look from the back. UKy says most beetles have it. The mark can be bold or broken into dots, and on some beetles it fills in.

Spots are not a reliable test for an orange ladybug. A beetle can have none or as many as 19. UKy adds that beetles with many spots tend to be females, and those with few or no spots tend to be males. For the full side-by-side, see our guide on how to tell a ladybug from an Asian beetle.

Convergent lady beetle: two white dashes

The convergent lady beetle is a native orange ladybug found from California to New Jersey, says UF/IFAS. It is orange with about 13 black spots, says UC IPM, and some have none. Behind the head, look for two white dashes that angle toward each other. That is where the name “convergent” comes from. It is also the ladybug sold in garden centres, which we come back to below.

Orange ladybug with no spots: polished and spotless lady beetles

An orange ladybug with no spots is often the polished lady beetle, Cycloneda munda. It is native, about 1/6 to 1/4 inch (4 to 6 mm), and orange or sometimes red, with no spots at all. UC IPM lists it, and the Vermont Atlas of Life notes it is often confused with the Asian lady beetle. Across the southern US, you may find the similar spotless lady beetle, C. sanguinea, instead.

Be careful, though. Some Asian lady beetles have no spots either. So check the plate behind the head. On the polished lady beetle it is mostly black with a white border. On the Asian lady beetle it is mostly white with a black M. BugGuide warns that colour alone cannot separate the two Cycloneda species where both occur.

Seven spots and no M: the seven-spotted lady beetle

If your orange ladybug has exactly 7 spots and no M, it is probably the seven-spotted lady beetle. Its wing covers are red or orange, and it has a small white spot beside each eye, says the Vermont Atlas of Life. It is not native either. BugGuide records releases from 1956 to 1971 and an established population in New Jersey in 1973.

Big and orange: eye-spotted and fifteen-spotted lady beetles

A large orange ladybug, up to about 3/8 inch (10 mm), on a tree is likely one of the native Anatis lady beetles. The eye-spotted lady beetle has black spots ringed in pale yellow, says BugGuide. The fifteen-spotted lady beetle starts out pale and darkens with age from orange to deep purple, notes the Vermont Atlas of Life. Both eat aphids on trees and rarely come indoors.

Where and when you found it is a strong clue

The place and the month narrow the list before you look closely. Use the table below, then confirm with the clue in the first table.

Our table, built from UKy, UMN, UC IPM, Cornell IPM, UConn and BugGuide. The order of likelihood is our judgement for a US home and garden.

Orange bugs that look like ladybugs

Several orange bugs look like ladybugs. Two of them are lady beetles that eat plants instead of aphids: the Mexican bean beetle and the squash beetle. Others are leaf beetles, a longhorn beetle, true bugs, or a ladybug’s own larva and pupa. Most are 1/4 to 1/2 inch (6 to 12 mm) long.

The two orange lady beetles that eat your garden

The Mexican bean beetle, Epilachna varivestis, is a lady beetle that eats bean leaves. Adults are 6 to 8.5 mm long with 16 black spots, says Cornell IPM. Young adults are yellow, and older ones turn copper. Both adults and larvae feed on the underside of leaves and leave them looking like lace. The larvae are yellow and covered in spines.

The squash beetle, Epilachna borealis, does the same on squash, pumpkins and other cucurbits. It is larger, about 7.4 to 9.8 mm, and orange or yellow, says BugGuide. UConn notes that its larvae chew the leaf edge in a half-circle pattern. A gardener on Reddit summed up the problem this summer: “Still having trouble identifying harmful vs beneficial ladybugs/squash beetles.” The quick test is the plant. A lady beetle on a bean or squash leaf full of holes is eating the leaf, not aphids.

Other orange look-alikes

From UC IPM, Espace pour la vie, MDC, BugGuide and UNH Extension. Pupa size is our estimate from a beetle of that length.

Boxelder bugs and Asian lady beetles often show up on the same sunny wall in the same weeks. If the bug is flat rather than domed and has red lines on its back, read our guide to the boxelder bug on your house. For other small red insects, see tiny red bugs.

Are orange ladybugs poisonous?

No. Orange ladybugs are not poisonous to touch and have no venom, says Poison Control. Their blood carries bitter alkaloids, which can irritate the mouth if one is eaten. The real risks are an allergy in some people and, rarely, a dog that chews a mouthful of beetles. Colour does not tell you which ones are dangerous.

When you squeeze one, it releases yellow fluid from its leg joints. Poison Control calls this reflex bleeding, and the fluid is the beetle’s blood. It smells sharp and can irritate the mouth. Parents on Reddit ask about this often, usually after a baby tried to eat one. If a baby or child puts one in their mouth, rinse the mouth with water, and wash any skin that touched the fluid with soap and water.

Allergy is the bigger point indoors. UKy says infestations can cause allergies in some people, from eye irritation to asthma. In a 2001 survey of Ohio households, 13% of those who answered reported a skin or breathing reaction to the beetles. University of Minnesota Extension adds that dead lady beetles in a building can cause reactions too. So vacuum the bodies, rather than leaving them on sills or in light fixtures.

Dogs are the case to know. In a 2008 case report, Stocks and Lindsey described a dog with 16 beetles stuck to the roof of its mouth, causing chemical burns. Poison Control notes the beetles were removed and the dog fully recovered. Cases like this are uncommon, but they happen when a dog chews a cluster.

Do orange ladybugs bite?

Yes, the Asian lady beetle, the usual orange ladybug, sometimes does. UKy says the bite “feels like a pinprick and is seldom serious.” Some can break the skin, causing minor, short-lived discomfort, according to University of Minnesota Extension. It has no venom. Native ladybugs are not known to bite people, says Poison Control.

They bite while looking for moisture or food, not to defend a nest, notes UMN. So a bite usually happens when one lands on your skin indoors. Wash the spot with soap and water. A small red mark that fades in a day or so needs nothing more.

A bite alone cannot tell you what bit you, so do not use a bite photo to name the insect. If you have bites and have not seen an orange ladybug land on you, our guide to common bug bites covers the usual indoor biters and the signs that need a doctor.

Are orange ladybugs bad or good?

Both. Outdoors, the orange ladybug most people find, the Asian lady beetle, is a useful predator. A single larva eats 600 to 1,200 aphids before it pupates, and an adult can eat more than 100 a day, says UC IPM. Indoors, it is a nuisance that bites, stains and smells. In the wider picture, it competes with native lady beetles, notes the Missouri Department of Conservation.

In a garden, then, leave them alone. They are eating the aphids, scale insects and mites on your plants. If you see lady beetles gather on one plant, check it for aphids with our aphid identifier. Spraying an insecticide kills the lady beetles along with the aphids, so the aphids often bounce back first.

There is one more cost that few people expect. Asian lady beetles crushed with grapes at harvest give wine a flavour called ladybug taint, says Penn State Extension. A 2021 review by Pickering and Botezatu traced it to chemicals called methoxypyrazines, with an earthy, peanut-like smell. Dead beetles can still taint the juice for about 3 days.

Why are orange ladybugs in my house?

An orange ladybug comes in to spend the winter. In fall, Asian lady beetles fly to buildings, usually from September through November, says UKy. In Kentucky, most arrive in October. They gather on the sunny southwest side, then crawl through gaps into walls and attics. They do not breed, lay eggs or feed in your house.

Light-coloured houses with dark trim draw the most. UKy says contrasting light and dark features attract them, and they gather on the sides lit by afternoon sun. In Minnesota, they fly to buildings between late September and late October, says UMN.

Most of the beetles stay hidden in the walls and attic until spring. On a warm, sunny day, some wake up and follow the warmth and light into your rooms. That is why one can appear in February with every window shut. It has been inside since October. University of Maine Extension confirms they do not breed, lay eggs or feed indoors, so the number does not grow over winter.

Our calendar, from the timing given by UKy, UMN and Ask Extension. Dates shift a few weeks with latitude.

How to get rid of orange ladybugs in your house

To get rid of orange ladybugs, vacuum the ones you see and empty the vacuum outside. Then seal every gap of 1/8 inch (3 mm) or more before next fall. Do not crush them, because they stain. UKy says indoor foggers and sprays are generally not recommended, so the first steps cost nothing.

What about light traps? The UF/IFAS office in Nassau County, Florida, suggests a black light trap run at night where beetles appear. In contrast, UKy says light traps catch relatively few beetles in the fall. A trap can help a little, but it will not replace sealing. Similarly, sticky tape catches a few and leaves dead beetles behind, which is not ideal for anyone with an allergy.

Insecticides, last and only if needed

If vacuuming and sealing work, you do not need an insecticide. Indoors, UMN says spraying “is not effective”, and UKy advises against foggers and bug bombs. Dead beetles left in wall voids also add to allergy problems, as UMN notes. Outdoors, a barrier treatment on the walls is an option for a severe, yearly problem.

Timing decides whether a barrier spray works. UKy puts it at late September to early October, just before the beetles arrive, and UMN gives the same window. A licensed pest professional can do this, often with better equipment for high walls. Outside that window, it is mostly wasted.

What does not work, and the myths behind it

Most advice about orange ladybugs rests on 6 shortcuts that fail. Colour does not tell you where a ladybug came from, spot counts do not either, and orange ones are not more poisonous. Indoor sprays, swatting and waiting for them to breed out do not solve anything either.

• Myth 1

  Myth: “Orange means Asian, red means native.”

  Truth: The Asian lady beetle runs from yellow-orange to deep red, says UC IPM. Meanwhile, the native convergent and polished lady beetles are orange. Check behind the head for the M instead.

• Myth 2

  Myth: “Native ladybugs have 7 spots.”

  Truth: The ladybug with 7 spots is the seven-spotted lady beetle, and it came from Europe, according to BugGuide. Native species vary: the convergent usually has 12 to 13 spots, and the polished has none.

• Myth 3

  Myth: “Native ladybugs are tiny, about 1/8 inch.”

  Truth: The common native lady beetles are about 1/6 to 1/4 inch (4 to 7 mm), says UC IPM. That is close to the Asian lady beetle, so size does not settle it.

• Myth 4

  Myth: “Orange ladybugs are the most poisonous kind.”

  Truth: No ladybug is poisonous to touch, says Poison Control. Within the Asian lady beetle, Bezzerides and colleagues found that more red area meant more alkaloid, but the shade of red did not. The claim that orange means toxic goes further than the research does.

• Myth 5

  Myth: “They are breeding in my walls.”

  Truth: They do not breed, lay eggs or feed indoors, according to UKy and University of Maine Extension. The ones you see in spring came in the fall before.

• Myth 6

  Myth: “Spraying inside will get rid of them.”

  Truth: UMN says indoor spraying is not effective, and UKy advises against foggers. You end up with dead beetles in the walls, which can still cause allergies.

Should you buy ladybugs for your garden?

Usually not. The orange ladybug sold in stores is the convergent lady beetle, collected from wild winter groups in California’s mountains. UC IPM reports that about 95% of released beetles in research studies flew away within 48 hours. The Xerces Society now asks gardeners to stop buying them.

The reason is biology. These beetles were collected while getting ready to migrate, so their first instinct after release is to fly. Xerces also cites research showing purchased beetles can spread a parasite to wild lady beetles. Citing Losey and colleagues, it puts the number taken from the wild at over three billion a year.

If you want more lady beetles, grow plants that hold aphids and pollen through the season, and avoid broad sprays. The orange ladybugs will find you. For an aphid problem right now, see our guide on getting rid of aphids, which starts with the methods that spare lady beetles.

When to call someone

Most homes never need outside help with an orange ladybug problem. Call a licensed pest professional if hundreds come in every fall despite sealing, or if they are in a high wall or attic you cannot reach. See a doctor for allergy or asthma symptoms, and a vet if your dog chewed a cluster.

• A licensed pest professional for an exterior barrier treatment in late September or early October, or for sealing high soffits and vents. Expect little help with the beetles already inside your walls. UKy advises against indoor sprays and foggers, and several Reddit users report exterminators telling them the same.
• A handyman or roofer for gaps around soffits, fascia, attic vents and siding that you cannot reach safely.
• Your landlord if you rent, since sealing the outside of the building is usually their job.
• A doctor if the beetles seem to cause asthma, hives or eye symptoms. Call 911 for trouble breathing or a swollen face or throat.
• Your vet if your pet drools, paws at its mouth or will not eat after chewing beetles.

Still not sure which orange ladybug you have? A sharp photo from above, showing the plate behind the head, is enough for our bug identifier by picture.

Pest control disclaimer. Photo-based identification can help, but it is not always perfect. For dangerous spiders, large infestations, or anything you are unsure about, contact a licensed pest control professional.