destructor population decreased significantly during the first year, then recover and kills the family in four years, without treatment. In northern European countries, brood stage is absent in winter and V. destructor is not controlled by an effective treatment (2).
In subtropical climate conditions, where broods are present throughout the year, a colony of Apis mellifera disappears in a year, if the population of V. The length of periods without brood, the level of foretic mites, bees and mite reproduction and mortality of mites are some of the factors with major impact on population trends of V. destructor is influenced by factors dependent on mite, on parasitized bee specie and the climate of the bee family. In addition, new hosts are found almost entirely without defensive response against new parasites. Being a relatively new parasite to a new host, host-parasite balance is not stable so that the bee family dies in a variable period of time, dependent on many factors.
Keywords: Varroa destructor, infestation evolution, Apis mellifera Recently, Varroa destructor conquered territories around the world, where Apis mellifera bees, exploited as hosts, inhabit for thousands of years. destructor mite populations in bee families under active season may reach, in the fall at the end of the active beekeeping season, damaging levels in the absence of specific treatment. In results interpretation was established that, in climatic conditions of western Romania, V. BALINT Faculty of Veterinary Medicine,, Calea Aradului, 119, Timisoara, Romania Summary In bee families untreated with acaricide substances during the active season population trends of infestation with Varroa destructor mites by determining indicators, daily natural mortality, level of infestation of adult bees and level of infestation of the brood, was monitored.
1 EVOLUTION OF VARROA DESTRUCTOR INFESTATION IN APIS MELLIFERA BEE COLONIES UNTREATED WITH ACARICIDES GH.
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