A grounded synthesis of representative open-access papers on the honey bee tracheal mite. Every claim is traceable to a cited study; curated overview, not exhaustive.
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The tracheal mite Acarapis woodi is an internal parasite that lives and breeds inside the breathing tubes (tracheae) of adult honey bees. Discovered in 1919, it was historically a serious concern, but its perceived importance has faded since the arrival of Varroa — and its true role in colony mortality has been debated for a century (Kojima 2011; McMullan 2009).
By colonising the tracheae and feeding on haemolymph through the tracheal walls, the mite impairs respiration. Experimental work shows infestation reduces the safety margin for oxygen delivery in flying bees, providing a physiological mechanism for the weakness and shortened life associated with heavy infestation (Harrison 2001).
The mite finds new hosts using chemical cues: it preferentially invades young bees, a preference mediated by cuticular hydrocarbons on the bee's surface (Phelan 1991; van Engelsdorp 2001). Because susceptibility is partly genetic, honey bees can be selectively bred for resistance — divergent selection has produced lines with markedly lower mite abundance, and resistance is linked to cuticular compounds that deter mite entry (Nasr 2001; Villa 2005).
Diagnosis traditionally requires dissection, but PCR-based detection now allows more sensitive screening (Kojima 2011). Control has relied on menthol and, in combination with Varroa treatment, formic acid fumigation, which conveniently controls both mites at once (Maeda 2016).
Tracheal mites are a reminder that Varroa is not the only mite of honey bees. Where they remain significant — and in regions like Asia where related species persist — resistant stock and integrated treatment (menthol, formic acid) keep them in check, often as a by-product of Varroa management.
Harrison et al., Journal of Experimental Biology 2001 · 43 citations — The physiological mechanism of harm.
Phelan et al., Journal of Chemical Ecology 1991 · 12 citations — The mite prefers young bees via chemical cues.
Nasr et al., Journal of Economic Entomology 2001 · 4 citations — Selective breeding produces resistant lines.
Kojima et al., Journal of Invertebrate Pathology 2011 · 7 citations — Sensitive molecular diagnosis.
McMullan & Brown, Experimental & Applied Acarology 2009 · 11 citations — The long-debated role in colony death.
Curated synthesis of representative and most-cited studies — not exhaustive. Explore via search. Related: Pests overview · Varroa overview.