Asian Giant Hornet ("Murder Hornet") — Fact Sheet

Scientific name: Vespa mandarinia Smith, 1852 Common names: Asian giant hornet, northern giant hornet (current ESA-preferred name), Japanese giant hornet, "murder hornet" (media label) Family: Vespidae (subfamily Vespinae) Status in the San Antonio / Boerne corridor: Not present. Never has been. Status in the United States: Officially eradicated. Declared December 18, 2024.

At a glance

Why this page exists

In 2020, during the early months of the COVID-19 pandemic, Asian giant hornets became one of the year's most viral news stories. The New York Times ran a feature article that turned the species into a media phenomenon, and "murder hornets" became a widely-recognized term within weeks.

Five years later, the situation is dramatically different than the 2020 panic suggested. The species has been eradicated from North America. No Asian giant hornet has ever been documented in Texas. Despite this, customer questions about "murder hornets in San Antonio" continue to come in regularly.

This page exists to clearly state the facts, address the misinformation, and — critically — help customers correctly identify the native Texas species they are actually seeing when they think they have spotted a murder hornet.

The eradication — what actually happened

Timeline

August 2019: Three Asian giant hornets discovered in Nanaimo, British Columbia, Canada. First North American records.

December 2019: First US detection. A Whatcom County, Washington homeowner found a deceased large insect on their doormat and witnessed similar live insects flying away. They posted it on Reddit. Community members told them to report it to the Washington Invasive Species Council. The council forwarded the report to state entomologists at the Washington State Department of Agriculture (WSDA), who confirmed the identification.

Early 2020: WSDA established trapping and reporting infrastructure. The COVID-19 pandemic complicated logistics dramatically. The New York Times published a feature article about the hornets in May 2020 that went viral, sparking the "murder hornet" media phenomenon.

October 2020: WSDA located the first Asian giant hornet nest in the United States, inside a hollow alder tree in Whatcom County. The nest was destroyed using carbon dioxide sedation, vacuum extraction, and sting-proof protective suits. The section of tree containing the nest was removed and remaining hornets extracted in a cold facility provided by Washington State University.

August–September 2021: Three additional nests located and destroyed.

2022: No detections.

2023: No detections.

2024: No detections through the end of the year. A community member reported a suspicious sighting in Kitsap County in October 2024, but this was not confirmed.

December 18, 2024: WSDA and USDA jointly announced the eradication of the northern giant hornet from Washington state and the United States.

Why the eradication succeeded

The eradication is genuinely a North American conservation success story. Several factors contributed:

• Early detection. Both initial sightings — Canadian and American — were reported by alert citizens within months of arrival, before the species could establish breeding populations.
• Rapid agency response. WSDA mobilized within weeks of the first detection.
• Citizen science participation. Half of confirmed detections came from public reports. The trapping and reporting infrastructure mobilized thousands of Washington residents during the active eradication period.
• Multi-agency cooperation. WSDA, USDA APHIS, Washington State University, the British Columbia Ministry of Agriculture, and other organizations coordinated across borders.
• Innovative removal techniques. Radio telemetry was used to track tagged worker hornets back to nests. Vacuum extraction with CO₂ sedation allowed live capture of nest contents for study.
• Species-specific factors. Asian giant hornets nest almost exclusively in subterranean cavities (often co-opted rodent burrows), which is more localized than aerial-nesting species and made nest detection more tractable than it could have been.

What remains uncertain

Despite the eradication declaration, ongoing vigilance is warranted. The species could be reintroduced — the original 2019 introductions occurred via shipping containers or imported larvae used in food/traditional medicine, both of which remain possible vectors. WSDA has stated they will continue monitoring and encourages community vigilance. Scientific Director Sven Spichiger explicitly noted: "They got here once and they could do it again."

For Texas, the practical implication is essentially zero. Any future Asian giant hornet introduction would almost certainly occur in coastal Pacific Northwest port cities, not in Texas, and would likely be detected and contained through the same monitoring infrastructure that succeeded in 2019–2024.

Why "murder hornet" became the popular name

The label originated in Japan, not the West. Sensationalist Japanese media outlets had used the term satsujin suzumebachi (殺人スズメバチ; literally "murderer sparrow hornet") for the species since at least 2008, alongside the standard Japanese name ōsuzumebachi ("giant sparrow bee/hornet").

The species is a serious public health concern in its native range. Asian giant hornets are estimated to cause 30–50 human deaths annually in Japan through severe sting reactions and venom-induced multi-organ failure. Between July and September 2013, hornet stings (predominantly V. mandarinia) caused 42 documented deaths in China.

This is genuinely deadly venom. The sting is not just painful — it contains a complex mixture of mastoparans that can trigger severe systemic reactions even in non-allergic individuals when delivered in sufficient quantity. Multiple stings can cause kidney damage, organ failure, and death. Dialysis can be used to remove the toxins from the bloodstream in severe cases.

When V. mandarinia arrived in North America in 2019, the established Japanese sensational nickname translated naturally into English as "murder hornet" — and the New York Times article that popularized it amplified the term internationally.

The Entomological Society of America in 2022 officially adopted "northern giant hornet" as the preferred common name for V. mandarinia, partly to move away from sensational naming and partly to reduce the species' association with anti-Asian sentiment that surfaced during the 2020 media cycle.

Identification — for completeness

If you are reading this in 2026 and somehow encounter a real V. mandarinia: it is enormous. Larger than essentially any wasp in North America. The defining features:

• Massive size. Workers 35–40 mm (1.4–1.6"), queens up to 50 mm (2"). Wingspan around 3 inches.
• Disproportionately large orange-red head, much larger and more orange than any native North American wasp's head.
• Huge mandibles clearly visible from a distance.
• Brown-and-orange banded abdomen — distinct from the black-and-yellow patterning of most American wasps.
• 6 mm (1/4") stinger that is large enough to penetrate standard beekeeper protective suits.

The size alone is the most reliable identifier. Asian giant hornets are dramatically larger than any common American wasp. If you see an apparently 2-inch-long wasp with a bright orange head, get a clear photograph, do not approach, and report it to your state department of agriculture. In Texas, that is the Texas A&M AgriLife Extension Service or Texas Department of Agriculture.

What you actually saw — Texas look-alike species

Every "murder hornet" sighting in Texas, including the entire 2020 media-cycle wave, has been a misidentification. Here are the actual species you almost certainly saw:

Cicada killer wasp (*Sphecius speciosus*) — the #1 candidate

This is what you saw 95% of the time. See fact sheet 10 for full details.

• 1.5–2 inches long, large enough to startle people
• Black abdomen with three yellow bands
• Rusty red head and thorax (somewhat similar coloration to AGH)
• Active July through August (peak murder hornet panic season)
• Males hover at face height in territorial displays — looks aggressive but cannot sting
• Females capable of stinging but are essentially non-defensive

Eastern carpenter bee (*Xylocopa virginica*)

• Big, fuzzy, with a yellow thorax
• Often confused with bumble bees but the abdomen is shiny and bare
• Males are aggressive in display but cannot sting
• Common in spring; nest in wood

Tarantula hawk wasp (*Pepsis* spp.)

• Genuinely large, 1.5–2 inches
• Distinctive iridescent blue-black body with bright orange wings
• Sting rated 4 on the Schmidt Index (highest possible) but extremely rare to encounter
• Solitary, non-defensive

Mature queen yellowjacket or paper wasp

• In early spring, freshly emerged queens are noticeably larger than the workers people are familiar with
• Brief seasonal appearance during nest-founding period
• Often misidentified as "giant hornets" because of unexpected size

Eastern bumble bee queen

• In early spring, foundress bumble bee queens are dramatically larger than workers
• Black-and-yellow, fuzzy
• Sometimes triggers "giant hornet" calls in March and April

What about Texas at all? — the climate suitability question

Distribution modeling done at Washington State University in 2020 suggested that **much of Western Washington and in fact much of North America provides suitable habitat for *Vespa mandarinia***. Including, in theory, parts of Texas.

This was one of the legitimate concerns during the 2020 introduction event — if the species had established and spread, climate suitability across North America was estimated to be broad. Pacific Northwest coastal forests, Eastern deciduous forests, and parts of the South all have climate and habitat profiles consistent with the species' native East Asian range.

However, climate suitability is not occurrence. The species was never present in Texas. The eradication in Washington means the species is not present anywhere in North America. Hypothetical climate suitability does not equal actual presence.

For Texas specifically, even if V. mandarinia were to reestablish in the Pacific Northwest, range expansion to Texas would take many years and would almost certainly be detected and addressed in intermediate states. Concerns about murder hornets in Texas are not warranted on any reasonable timeline.

Risk to humans and pets in our service area

Zero. The species is not present.

The risk to honey bees in our service area from "murder hornets" is also zero. Honey bee colonies in Texas face many real threats — Africanized honey bee genetics, varroa mite, small hive beetle, pesticide exposure, colony collapse disorder, hive raiding by other native species. None of these threats include Vespa mandarinia.

Treatment approach

If a confirmed Asian giant hornet were ever detected in our service area, treatment would not be a routine pest control matter. The protocol would involve:

• Immediate notification of Texas A&M AgriLife Extension and Texas Department of Agriculture
• USDA APHIS would likely become involved given the agricultural significance
• Removal would be conducted by trained agency personnel using protocols developed by WSDA during the 2020–2021 eradications — including CO₂ sedation, vacuum extraction, and sting-proof protective equipment
• The site would be subject to ongoing monitoring for additional individuals

This is not pest control work. This is agricultural quarantine response.

For the actual situation we encounter — customer reports of "I saw a murder hornet" — the correct response is identification of the actual species present. Photographs help. We can identify the species and provide appropriate treatment recommendations for whatever native species is actually involved.

Odd, funny, and genuinely true

• The "murder hornet" name predates the 2020 media cycle by over a decade. Japanese sensational media had been using satsujin suzumebachi ("murderer sparrow hornet") since at least 2008. The English translation simply caught up to the Japanese usage when the species arrived in North America.
• The first US detection in 2019 was reported via Reddit. A homeowner in Whatcom County found a dead specimen on their doormat, posted it to Reddit asking for identification, and Reddit users told her to report it to the Washington Invasive Species Council. This is genuinely how one of the most consequential invasive species detections of the 21st century was initiated.
• The species has existed since the Miocene epoch — fossils from the Shanwang Formation in China date the species back roughly 15 million years. V. mandarinia was attacking other insects when proto-hominids were just beginning to evolve.
• In Korea, the species is called 장수말벌 (Jaŋsumalbôl), meaning "general giant wasp" or "general hornet."
• In Taiwan, the name translates as "giant tiger head bee" — referring both to its size and the orange face that resembles a tiger's coloration.
• The hornets can decimate a honey bee colony in 90 minutes. Once they enter "slaughter phase" against a hive, a few hornets can decapitate the entire bee population using their large mandibles. The bees are killed, the hornets then occupy the hive and steal the larvae as food for their own brood.
• Asian honey bees evolved a counter-defense. When V. mandarinia scouts attempt to attack an Asian honey bee (Apis cerana) hive, the bees swarm the scout and form a "bee ball" around her, vibrating their flight muscles to raise the internal temperature to about 47°C — hot enough to kill the hornet but not the bees. European honey bees (Apis mellifera) — the species used in North American beekeeping — do not have this defense, which is part of why the 2020 invasion was such a serious concern for Pacific Northwest apiaries.
• Asian giant hornets nest underground. Of 56 documented nests in one study, only 9 were above ground. The species almost exclusively co-opts pre-existing tunnels dug by rodents, or uses cavities near rotten pine roots. This subterranean habit made eradication tractable — nests are localized and detection by trained crews using radio telemetry was feasible.
• The 2020 Washington State eradication was complicated by COVID-19. The pandemic disrupted normal agency operations, complicated travel and equipment availability, and overlapped with the period when public attention to "murder hornets" was at peak intensity. WSDA staff worked under unusual conditions during the initial eradication period.
• The first US nest contained approximately 500 specimens when extracted in October 2020 — a relatively young, small colony. If left undetected for another year, it could have produced many new queens that would have established multiple colonies the following season. Early detection genuinely prevented North American establishment.
• DNA analysis of the 2019 detections suggested two separate introductions from different countries of origin — meaning the British Columbia and Washington discoveries were not from a single event. This was a striking finding because it implies that whatever pathway brought the hornets to North America in 2019 was operating multiple times in parallel.
• Distribution modeling shows much of North America could host the species. The 2020 Washington State University analysis suggested suitable habitat from the Pacific Northwest across the northern US, into the Great Lakes region, and across much of the South. Texas habitat suitability is included in this modeling. The species is not here, but the climate would not, in theory, exclude it.

FAQ hooks (for LuperIQ / SEO)

• Are murder hornets in Texas?
• Is the murder hornet still in the United States?
• What happened to the murder hornets?
• Asian giant hornet vs. European hornet
• I saw a giant hornet in San Antonio — what was it?
• Has the Asian giant hornet been eradicated?
• Are murder hornets dangerous to bees?
• What does a murder hornet look like?

Sources consulted for this fact sheet include the Washington State Department of Agriculture's official December 18, 2024 eradication announcement, USDA APHIS announcement "Victory Over the World's Largest Hornet Species" (December 2024), the Asian giant hornet Wikipedia account, the Invasive Species Council eradication summary, HistoryLink.org's contemporary documentation of the 2020–2024 eradication effort, the Smith-Pardo et al. 2020 paper on Vespa diversity in the United States (Insect Systematics and Diversity), the National Invasive Species Information Center's species profile, distribution modeling done at Washington State University in 2020, and the Entomological Society of America's 2022 common name change documentation.