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How to identify it
- Adults are 4 to 7 mm (1/6 to 1/4 inch) long, dome-shaped on top, flat underneath and distinctly oblong from above, with orange wing covers.[1]
- Spot counts vary. UC IPM says the wing covers commonly carry 13 black spots and some individuals have fewer or none, while Nebraska Extension says they may have as many as 12 spots and some adults have none.[1][4][5]
- The thorax is black with a white margin and two short white lines that converge toward each other, which give the species its name.[1][2][5]
- Eggs are oblong, yellow and about 1 mm (1/25 inch) long, laid on end in clusters of about 10 to 30 on leaves and green stems near aphids.[1]
- Larvae are blackish with orange blotches, long-legged and active, and look like tiny alligators; they grow to about 6 mm (1/4 inch). Pupae are about 5 mm long, orange at first and then blotched with black, and are glued to plants near where the larvae fed.[1][4]
Look-alikes
| Look-alike | How to tell them apart |
|---|---|
| Multicolored Asian lady beetle | This larger beetle ranges from red to yellow with no spots or up to 19, and its thorax is often cream colored with black markings.[4] |
| Spotted cucumber beetle | This plant-feeding pest has long antennae; lady beetles have short, sometimes hard-to-see antennae.[4] |
| Other Hippodamia lady beetles | Hippodamia species are more oblong than most lady beetles and have split, two-pointed claws on their feet. At least ten Hippodamia species in California have forms with converging white bars on the thorax, and two forms of Hippodamia quinquesignata cannot be reliably told from the convergent lady beetle without expert dissection.[1] |
Where it lives
A native North American beetle. GBIF holds about 47,000 U.S. records since 1990, the most from California, Texas and Colorado, plus records from Mexico, Canada and several South American countries. It was introduced to South America in the 1950s, and genetic work finds eastern U.S., western U.S. and South American populations distinct, with little sign of mixing despite repeated releases.[2][3][6][7][8]
Biology and life cycle
Females can lay several hundred eggs over a growing-season life of about two months, and larvae pass through four instars before pupating. In a lab study of commercially sold beetles, development from egg to adult took about 15 days.[1][9]
California populations have two or more generations a year. Many adults from coastal and valley areas fly to the Coast Range or Sierra Nevada foothills in summer, overwinter there in aggregations on low vegetation at moist sites, and return to lower elevations in late winter.[1]
In Colorado the beetles may make summer migrations to the mountains and gather in large groups, often around prominent points above 9,000 feet. Colorado State notes these mass aggregations form each year along the Front Range but are not seen west of the Continental Divide. In Nebraska, overwintering groups of thousands are sometimes found in wooded areas in late fall and early spring, and in summer heat they gather in shady spots or along lake shores.[3][5]
Huddling helps them through winter: in lab tests, beetles held in groups of 10, 25 or 50 had lower metabolic rates per beetle than single beetles, especially at low temperatures. One of their defensive odor compounds also works as an aggregation pheromone that draws beetles to winter sites.[10][11]
Damage and signs
- They don't feed on plants. Adults and larvae eat soft-bodied insects, insect eggs and especially aphids. Young larvae pierce their prey and suck out the contents, while older larvae and adults chew and can eat the whole insect.[1]
Health risk
It is a predator of aphids and other small insects. UC IPM, Colorado State and Missouri Conservation treat it as a beneficial insect and describe no health concern for people.[1][3][2]
Control
Prevention
No control is needed. Learning the life stages helps you tell this beneficial apart from plant-feeding pests.[4]
Biological control
Conserve the lady beetles already in your yard. Colorado State says this works far better than buying beetles and that lady beetles need aphids or other prey to feed on; UC IPM warns that residues from most insecticides are likely to kill them.[3][12]
Store-bought convergent lady beetles are vacuumed up from overwintering aggregations in western foothills and mountains, so they are primed to disperse. UC IPM says most fly away within 1 or 2 days of release even when aphids are plentiful, and about 95% flew away within 48 hours in research studies. Colorado State adds that they are usually in reproductive diapause and resume laying eggs only after several weeks of feeding.[1][12][3]
If you do release them, keep them refrigerated until use, mist them lightly with water, release them at dusk or early evening at the base of plants, and don't put them on plants sprayed with insecticides. Expect to need many: in UC research, one large, heavily infested rose bush needed two releases of about 1,500 beetles each, a week apart, while most store packages hold enough for one shrub or a few small plants.[12]
Collected beetles can carry natural enemies. Colorado State notes that some contain a parasitic wasp it names Perilitus coccinellae, studies of this beetle name its braconid parasitoid Dinocampus coccinellae, and lab work on commercially sold beetles found a microsporidian pathogen that cut egg production and shortened life.[3][13][9]
Researchers note that western beetles are collected and released across the eastern United States with little knowledge of how well the releases work.[8]
Common questions
- Why did the ladybugs I released fly away?
- Beetles collected from overwintering aggregations are primed to migrate. UC IPM says about 95% of released beetles flew away within 48 hours in research studies, and Colorado State says to expect released lady beetles to leave the garden.[12][1][3]
- Is that spiny black-and-orange larva a pest?
- Probably not. Lady beetle larvae are active, have six long legs and look like tiny alligators; convergent lady beetle larvae are blackish with orange blotches, and they eat aphids.[4][1]
- How do I tell it from the Asian lady beetle?
- Look behind the head: the convergent lady beetle's black thorax has two converging white lines and a white margin, while the larger multicolored Asian lady beetle's thorax is often cream colored with black markings.[1][4]
Sources
- University of California Statewide IPM Program, “Convergent Lady Beetle (Natural Enemies Gallery).” ipm.ucanr.edu/natural-enemies/convergent-lady-beetle/ (accessed 2026-11-11)
- Missouri Department of Conservation, “Lady Beetles (Ladybird Beetles; Ladybugs) (Field Guide).” mdc.mo.gov/discover-nature/field-guide/lady-beetles-ladybird-beetles-ladybugs (accessed 2026-11-11)
- Colorado State University Extension, “Lady Beetles (Fact Sheet 5.594).” extension.colostate.edu/topic-areas/insects/lady-beetles-5-594/ (accessed 2026-11-11)
- University of California Statewide IPM Program, “Lady Beetles (Home and Landscape).” ipm.ucanr.edu/home-and-landscape/lady-beetles/ (accessed 2026-11-11)
- University of Nebraska-Lincoln Extension, “Lady Beetles of Nebraska (EC1780).” extensionpubs.unl.edu/publication/ec1780/2007/pdf/view/ec1780-2007.pdf (accessed 2026-11-11)
- Global Biodiversity Information Facility (GBIF), “Hippodamia convergens: U.S. occurrence records since 1990 by state (GBIF occurrence search).” api.gbif.org/v1/occurrence/search?taxonKey=4989894&country=US&hasGeospatialIssue=false&occurrenceStatus=PRESENT&year=1990%2C2026&facet=stateProvince&facetLimit=400&limit=0 (accessed 2026-11-11). Exact count at access: 46,950 U.S. records since 1990 (California 22,917; Texas 6,272; Colorado 3,841).
- Global Biodiversity Information Facility (GBIF), “Hippodamia convergens: occurrence records since 1990 by country (GBIF occurrence search).” api.gbif.org/v1/occurrence/search?taxonKey=4989894&hasGeospatialIssue=false&occurrenceStatus=PRESENT&year=1990%2C2026&facet=country&limit=0 (accessed 2026-11-11). Exact counts at access: 54,509 records since 1990; United States 46,950, Mexico 3,070, Canada 1,080, Ecuador 891, Argentina 888, Brazil 823.
- Evolutionary Applications, via PubMed, “Go west: Population genomics reveals unexpected population fluctuations and little gene flow in Western hemisphere populations of the predatory lady beetle, Hippodamia convergens (Sethuraman et al. 2024).” pubmed.ncbi.nlm.nih.gov/38283604/ (accessed 2026-11-11)
- Journal of Invertebrate Pathology, via PubMed, “Effects of an unidentified microsporidium on the convergent lady beetle, Hippodamia convergens, used for biological control (Joudrey and Bjornson 2007).” pubmed.ncbi.nlm.nih.gov/17081559/ (accessed 2026-11-11)
- Journal of Insect Physiology, via PubMed, “Aggregations reduce winter metabolic rates in the diapausing ladybeetle Hippodamia convergens (Szejner-Sigal and Williams 2022).” pubmed.ncbi.nlm.nih.gov/35026302/ (accessed 2026-11-11)
- Journal of Chemical Ecology, via PubMed, “Defensive allomones function as aggregation pheromones in diapausing ladybird beetles, Hippodamia convergens (Wheeler and Carde 2013).” pubmed.ncbi.nlm.nih.gov/23657436/ (accessed 2026-11-11)
- University of California Statewide IPM Program, “Lady Beetles: Do They Really Work for Aphid Control? (Retail Nursery and Garden Center IPM News, May 2017).” ipm.ucanr.edu/pdf/pubs/retailipmnews.2017.may.pdf (accessed 2026-11-11)
- Journal of Invertebrate Pathology, via PubMed, “The convergent lady beetle, Hippodamia convergens, and its endoparasitoid Dinocampus coccinellae: the effect of a microsporidium on parasitoid development and host preference (Saito and Bjornson 2013).” pubmed.ncbi.nlm.nih.gov/23333422/ (accessed 2026-11-11)
- iNaturalist, “Hippodamia convergens taxon page (order and family).” www.inaturalist.org/taxa/48987 (accessed 2026-10-06)