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The study objective is to study the effectiveness of lactic acid in varroatosis and its impact on the development of bee colonies under conditions of the South of Tyumen region. The acaricidal effectiveness of lactic acid was studied in October 2019 using one method in two experiments in 30 broodless bee colonies kept in two apiaries, where bee colonies were divided into 2 groups (experimental 10 colonies and control groups of 5 colonies each). For treatment of bee colonies from the experimental group, frames with bees were removed from the hives in turn, which were sprayed with a 15.0% aqueous solution of lactic acid in the volume of 5 ml on each side of the honeycomb. Bee colonies were treated twice with an interval of 5 days. The bees in the control group were not treated. Dead mites were registered on a daily basis in all groups within 5 days after each treatment, for these reasons laminated cardboard sheets were placed on the bottom of the hives, which then were taken out and the number of fallen ectoparasites was recorded. Studies on the impact of lactic acid on the development of bee colonies were conducted in 20 brood bee colonies in the period from May to July 2020. It has been found that the effectiveness of treatment of experimental bee colonies with the drug was 90.0±2.1% (apiary No 1) and 7.8±1.9% (apiary No 2). At the same time, the maximum death of mites in colonies was observed during the first day after treatment. In the control groups, the number of mites decreased by 10.9±0.8% and 11.6±1.0%, respectively. It has been established that the treatment of bees with an aqueous solution of lactic acid in the above concentration, dose and multiplicity did not have a negative impact on the development of bee colonies, their strength and food supply, and no deaths of bees and queens were detected during the observation period.

Study of effectiveness of lactic acid at varroatosis in the apiaries of Tyumen Region, Russia