Natural mite mortality was recorded in honey bee colonies and treatments were performed with various acaricides against Varroa destructor and acaricide efficacies were evaluated. Colonies were treated with flumethrin and/or oxalic acid and with flumethrin, oxalic acid or amitraz. The efficacy of flumethrin averaged 73.62% compared to 70.12% for three oxalic acid. A reduction of 12.52% in mite numbers was found 4 weeks after flumethrin application in colonies with low infestation levels, 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that synthetic acaricides should be constantly re-evaluated and the use of flumethrin at low efficacies need to be superseded by appropriate organic treatments to increase the efficacy of mite control in highly-infested colonies during the period of brood rearing.
F.22 Improvement to existing health/diagnostic methods/procedures
COBISS.SI-ID: 3588456Morphological changes and immunohistological characteristics were described in hypopharinegeal glands after pesticides treatments.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 3662952