Varroa is a genus of parasitic mites associated with honey bees, placed in its own family, Varroidae. The genus was named for Marcus Terentius Varro, a Roman scholar and beekeeper. The condition of a honeybee colony being infested with Varroa mites is called varroosis (also, incorrectly, varroatosis).
Varroa mites are recognised as the biggest pest to honeybees worldwide, and are believed to be the single largest contributing factor in the modern-day decline of honeybees, due to their ability to transmit diseases such as deformed wing virus to larval or pupating bees, resulting in death or severe deformity of the pupae.
n. (context beekeeping chiefly New Zealand English) Infestation with the mite (taxlink Varroa destructor species noshow=1), or the disease caused by such mites