Acute paralysis virus of the honey bee (Apis mellifera) in a Hungarian apiary infested with Varroa jacobsoni mite

Viruses of the honey bee have been known for a long time; however, recently the attention of scientists and beekeepers has turned towards the relation ship between these viruses and the parasitic mite Tr. jacobsoni. Although c linical symptoms indicated the presence of some of the viruses of bees in H ungary, none have previously been isolated or identified. During July unusu al adult bee and brood mortality was observed in some colonies of an apiary in Budapest known to be infested with V. jacobsoni. Large amounts of acute paralysis virus (APV) were detected serologically in healthy honey bee pup ae killed by the injection of a bacteria-free extract of diseased adult bee s. Crystalline arrays of 30 nm particles were seen in ultra thin sections o f the tissues of injected pupae and naturally infected adult bees. In spite of the application of acaricide treatments, the bee population in several colonies had collapsed by the end of summer and the apiary suffered severe wintering losses.