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Summary —Queen honey bees, Apis mellifera L., exhibited a rapid decline in susceptibility to infes- tation by the tracheal mite, Acarapis woodi (Rennie), with increasing age. Ten-day-old queens are invaded by 1.0 mites per queen, while queens one day of age had 6.5 mites. Laying queens remov- ed from colonies during requeening had an A. woodi incidence rate of 30.6%. Newly mated queens obtained from mating nuclei infested with A. woodi had an incidence rate of 14.3%. Additionally, queens stored in queen banks prior to shipment may be subject to further mite pressure as we found that A. woodi was able to move through wire screening from infested to uninfested workers during food exchange.

Incidence rates of Acarapis woodi (Rennie) in queen honey bees of various ages