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Tropilaelaps: Threat & Research

BEE HEALTH / THREAT AWARENESS & RESEARCH

A small mite with a serious impact on hives

Tropilaelaps mites attack developing honey bees and can build up rapidly. This page brings together what beekeepers need to recognize the threat and the research we have collected on detection, spread and control.

Reviewed October 29, 2026 · 41 linked references, reports and reading resources

Range map · New Jersey interception · Recognition · Treatments · Heat evidence · Research library

New research update: What the 2024 Tropilaelaps brood-break study actually found — 51 colonies, four treatment groups, and heat-treatment research implications.

Where has it been found?

The main expanding threat to managed western honey bees is T. mercedesae. Published records extend through Asia into Georgia, parts of Russia, Uzbekistan and Kazakhstan. The map shows selected country/region records, rather than the boundaries or prevalence of infestation. [G6] [B6]

Documented Tropilaelaps records, October 29, 2026Türkiye*W. RussiaGeorgiaKazakhstanUzbekistanAfghanistanPakistanIndiaNepalMyanmarThailandVietnamChinaS. KoreaPhilippines(Palawan)IndonesiaPapua New Guinea
Gold: published Asian records. Red: recent westward records. Teal star: the confirmed Tropilaelaps spp. outbreak in Türkiye. Locations are representative, not exact apiary coordinates. Basemap: Natural Earth, public domain. Occurrence sources: Brandorf et al. 2026; the 2026 range synthesis; UK Defra/APHA. Sources and identification scope are linked below.

Türkiye is now a confirmed record. The August 24 EURL note described suspected presence. Türkiye subsequently confirmed an outbreak in Çavuşlu, Artvin Province, on August 31, 2026, via WAHIS. The later UK official notice supersedes the earlier suspected status; its report is at genus level, Tropilaelaps spp. [G7] [G8]

United States: APHIS’s national-survey page reports verified absence. We found no official established U.S. population report in the sources checked for this page. The ship interception described below is a separate event. [G1] [G4]

Cold winters are not a guarantee. A 2026 study repeatedly found mites in southern Russia and Kazakhstan, including regions with seasonal brood interruption. It did not resolve whether persistence within colonies, repeated introductions or other mechanisms explained every finding. [B6]

The 2025 New Jersey–bound ship interception

On July 24, 2025, crew discovered a swarm of giant honey bees, Apis dorsata, on a cargo vessel bound for Newark–Elizabeth, New Jersey. The vessel had called at India, Pakistan and Oman. It was still about 3,600 nautical miles from its destination when the swarm was intercepted. Under U.S. officials’ guidance, crew contained the bees in a bag and froze them aboard ship to prevent release. Laboratories recovered 28 female T. mercedesae mites and confirmed their identity morphologically and by DNA barcoding. [G4]

This was a prevented entry, not an established New Jersey hive infestation. The broodless swarm also challenged assumptions that mites carried on adult bees could survive only a very short journey. Estimated association periods depend on uncertain swarm-origin scenarios; they are not a controlled survival experiment. [G4]

Why it is easy to overlook—and why it matters

About 0.6–1 mm long

Adults are reddish-brown, narrow and fast moving. They can be visible to the eye, but are small enough to miss. Confirmation uses expert microscopy and sometimes molecular testing. [G2]

Brood damage can escalate

The life cycle takes about a week. Feeding damage, brood death, poor emergence and shortened adult life can weaken a colony and lead to collapse. Signs overlap other disorders, so visual symptoms alone are not diagnostic. [G2] [B4]

Both mites can be present

Tropilaelaps and Varroa can co-infest a colony. Identifying one does not exclude the other, and controlling Varroa does not establish Tropilaelaps control. The Thailand treatment study examined both together. [H1]

A negative adult-bee wash does not rule it out. Tropilaelaps spend much of their time associated with brood. In one 2026 Papua New Guinea trial, alcohol washing detected mites in only 41% of 27 known-infested colonies under the tested protocol. Detection sensitivity varies with method, infestation and sampling. Brood inspection, appropriate collection methods and expert identification remain important. [D2] [G2]

How limited are chemical treatments?

Effective options exist, but a familiar Varroa product is not a dependable substitute for Tropilaelaps evidence. A 2017 Thai trial found that Apivar (amitraz) did not reduce mites under the tested conditions and HopGuard did not provide adequate control. Formic acid had the strongest commercial-product result in that comparison, although treatment and colony effects varied with season. These are study-specific findings, not a claim that an ingredient can never work under another protocol. [S1]

In the 2025 Thailand trial, Formic Pro and liquid formic acid immediately reduced both mite populations and maintained near-zero live mites in sampled capped cells during three weeks of follow-up. A 2026 Georgian study adds temperate-region formic-acid evidence. Formulation, environmental conditions, timing and bee safety still require attention. Follow applicable product directions and local authority guidance. [H1] [H2] [S4]

Brood interruption is another evidence-backed approach. Trials have examined brood breaks alone or combined with formic or oxalic acid. Results depend on creating the intended break: simply removing capped brood is not the same as eliminating all feeding brood, because mites can also feed on open larvae. [S2] [B1]

Heat treatment: promising evidence, more study needed

EvidenceProtocol & findingLimit
Published colony trial
Sankovitz et al. 2025		Heating pads; 106°F / 41.1°C for 160 minutes once. Reported Tropilaelaps reduction: 85.42% by week three.Week-two rebound; population change over follow-up, not an immediate kill rate or eradication. [H1] [H2]
Preliminary removed-comb report
Georgia, 2025		Mites in examined cells were reported dead after 107.6°F / 42°C for three hours; a larger chamber run used 42–44°C.Not treated here as a replicated peer-reviewed trial. Mite denominators, controls and delayed brood/queen safety data are inadequate. [H3]
Ongoing heated-box research
Jeju		Research described in the October 2026 National Geographic report.A research lead; the news article does not establish a validated efficacy percentage or full protocol. [H5]

Further study should measure actual brood-cell temperatures, delayed mite mortality, rebound, repeat schedules and effects on brood, adult bees and queen function. We did not identify a controlled Tropilaelaps trial of 106°F / 41.1°C for 24 hours among the references collected here. Varroa heat studies are useful context, but are not a substitute for direct Tropilaelaps evidence. [H1] [V1]

View and download our heat-treatment research sheet.

What to do if you suspect it

Contact your state apiary inspector or animal-health authority promptly. Pause movement of suspect colonies, brood and used equipment while seeking instructions. Coordinate specimen handling with the receiving laboratory; do not ship live suspect mites. In the United States, suspected Tropilaelaps is immediately reportable under APHIS’s case definition. [G2]

Shared guides & research

Start with these guides when you need to identify a mite, compare species or understand treatment evidence. Use the mite-specific information on this page to choose the appropriate tests and controls.

Our collected research library

41 linked references, reports and reading resources. Primary studies, agency guidance, preliminary work and background reading are labeled separately. “Abstract reviewed” does not mean the full paper was independently verified. This is the research collection gathered so far, not an exhaustive systematic review.

Direct heat evidence and ongoing work
Chemical and cultural control
Detection and monitoring
Biology, damage and survival
Distribution, interception and official guidance

G1 · 2025 · Agency guidance

USDA APHIS National Honey Bee Surveys

Official US absence and national-surveillance reference; page last modified July 7 2025.

Agency page reviewed October 29 2026

G6 · 2026 · Peer-reviewed range synthesis

Global range of Tropilaelaps mercedesae

Confirmed morphological and molecular records; separates verified occurrences from assumptions about country-wide distribution.

Indexed publication and its country table reviewed.

G7 · 2026 · Official outbreak update

UK Defra/APHA: confirmed Tropilaelaps outbreak in Türkiye

Türkiye confirmed an outbreak at Çavuşlu, Artvin, on August 31, 2026, through WAHIS. This supersedes the earlier suspected-status report.

Official page updated October 9, 2026; reviewed October 29.

Bee and queen safety: indirect Varroa/heat context
Reviews and further reading

R4 · 2026 · Research index

Tropilaelaps research portal Control bibliography

Expert-partnership portal displaying 64 control records; use filters to extend this collection.

First displayed records and article links inspected; not all 64 papers assessed

Educational resource by VarroaDestructor.com and BeekeepersLibrary.com. Source dates and study limitations are retained so readers can distinguish established findings from research leads.