Island population of European honey bees in Northeastern Brazil that have survived Varroa infestations for over 30 years.

European honey bees were introduced to Fernando de Noronha Island in 1984 already infested by Varroa destructor, and since then they have survived without any control measures. In 2012, adult and brood infestation rates were measured and compared to historical records. There was no significant difference in mite levels between the values obtained in 1996 (14 mites/100 adult bees) and 2012 (16.5 mites/100 bees). The percentage of mites that reproduced in worker brood cells also was not significantly different from the data obtained in 1996. The frequency of hygienic behavior was similar to data obtained for resistant African-derived honey bees. Average fecundity decreased slightly between 1996 and 2012, but remained high. From our data, we conclude that those bees have maintained stable infestation levels for at least 16 years. Infestation rates remain high, at rates that would be fatal to honey bees in most regions of the world, but there is no Varroa-related colony mortality on the island. [ABSTRACT FROM AUTHOR]