1 University of Ljubljana, Biotechnical faculty, Department of biology, Večna pot 111, SI-1000 Lj... more 1 University of Ljubljana, Biotechnical faculty, Department of biology, Večna pot 111, SI-1000 Ljubljana, Slovenia 2 Institute Jožef Stefan, Jamova c. 39, SI-1000 Ljubljana, Slovenia 3 Agricultural Institute of Slovenia, Hacquetova ul. 17, SI-1000 Ljubljana, Slovenia 4 New address: Čebelarstvo Cvet, Žeje 30, SI-1233 Dob, Slovenia 5 University of Ljubljana, Biotechnical faculty, Department of Animal Science, Groblje 3, SI-1230 Domžale, Slovenia 6 Corresponding author, e-mail: peter.dovc@bf.uni-lj.si ABSTRACT Apis mellifera carnica is a honey bee subspecies, first described by Pollmann in 1879. Its original habitat since the last glaciation is Balkan Peninsula with neighbouring regions. Slovenia is often mentioned as a homeland of Carniolan honey bee although it is evident that natural habitat of A. m. carnica, is much bigger and that Slovenia sits at the western edge of its areal. Due to its soft temper, adaptation to extreme low temperatures, good honey production in spring and summ...
During 2007 and 2008, natural mite mortality was recorded in honey bee colonies. These colonies w... more During 2007 and 2008, natural mite mortality was recorded in honey bee colonies. These colonies were then treated with various acaricides against Varroa destructor and acaricide efficacies were evaluated. In 2007, experimental colonies were treated with flumethrin and/or oxalic acid and in 2008 the same colonies were treated with flumethrin, oxalic acid or amitraz. The efficacy of flumethrin in 2007 averaged 73.62% compared to 70.12% for three oxalic acid treatments. In 2008, a reduction of 12.52% in mite numbers was found 4 weeks after flumethrin application, while 4 oxalic acid applications produced significantly higher (P < 0.05) mite mortality, an average of 24.13%. Four consecutive amitraz fumigations produced a 93.82% reduction on average in final mite numbers and thus ensure normal colony development and overwintering. The study is important in order to demonstrate that synthetic acaricides should be constantly re-evaluated and the use of flumethrin at low efficacies need ...
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