Effectiveness of Oxalis bee and Ecostop for prophylaxis and control of varroosis in honey bees (Apis mellifera L.)

I. Zhelyazkova*, S. Lazarov
Department of Animal husbandry – Non-ruminants and other animals, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria

(Manuscript received 24 August 2018; accepted for publication 26 October 2018)

Abstract. The objective of the present study is to determine the effectiveness of Ecostop (plates) and Oxalis Bee – plant-based products for the prevention and control of varroosis in bees (Apis mellifera L.).The study was conducted at the end of the 2017 Beekeeping Season of the Beekeeping Experimental Training Center at the Faculty of Agriculture, Trakia University, Stara Zagora. Two products were used: Ecostop containing peppermint oil (2 ml/plate) and timol (5 g/plate), and Oxalis Bee – zootechnical feed additive for bees, including plant extracts, organic acids and invert solution from bio-sugar. The dosing of the products is in accordance with the instructions of the producers Primavet-Sofia Ltd., Bulgaria and the company Vechni pcheli Ltd., Bulgaria. The development and extensinvasion of bee colonies at the beginning and the end of the study and the effectiveness of the applied products were determined. It has been established that the development of bee colonies is normal for the end of the beekeeping season. The comparative analysis of the acaricidal effect of the test products against Varroa destructor shows 98.55±0.30% for Ecostop and 78.15±8.76% for Oxalis Bee. The reported difference in efficacy of both preparations is reliable at p≤0.05.

Effect of amitraz on varroosis in bees (Apis mellifera L.)

K. Gurgulova1, I. Zhelyazkova2*, S. Takova1, K. Malinova3

1National Diagnostic and Research Veterinary Medical Institute, 1000 Sofia, Bulgaria
2Department of Animal Science, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria
3Department of Ecology and Landscape Architecture, Faculty of Agriculture, Forestry University, 10 Kliment Ohridsky, 1756 Sofia, Bulgaria

Abstract. In European (Western) honey bee Apis mellifera L. Varroa mites must be continuously monitored to allow colonies to develop normally and realize high productivity and quality of bee products. A clinical trial of veterinary-medical product, based on amitraz, in the form of strips (VMP Apivar ® – 3.33% amitraz) was carried out in the autumn of 2011. High efficiency of the active substance against Varroa destructor in apiaries on the territory of Bulgaria is determined. After exposure of 46 to 78 days high efficiency on varroosis (Varroa destructor) is achieved – average in four apiaries from 99.00% to 99.86%.

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