Control of varroosis with oxalic acid trickling under conditions in the Czech Republic

Oxalic acid is a powerful acaricide commonly used for the control of varroosis. The winter trickling of a bee colony constitutes an easy and effective treatment method leaving no harmful residues in bee products. Due to some scepticism in the Czech Republic about using oxalic acid for the winter treatment of a colony the object of the study was to verify this application under the Czech conditions and to test an alternative way of the oxalic acid application potentially reducing the winter disturbation of a colony. The results prove the high effectiveness (> 95%) of the trickling also under conditions in the Czech Republic including for newly proposed way of treatment not requiring a super unfolding. The results are discussed also in relation to the Czech beekeeping practice.