Abstract
The parasitic mite Varroa destructor Anderson and Trueman continues to devastate western honey bee (Apis mellifera L.) colonies throughout most of the world where they are managed. The development of a method to rear Varroa in vitro would allow for year-round Varroa research, rapidly advancing our progress towards controlling the mite. We created two separate experiments to address this objective. First, we determined which of four in vitro rearing methods yields the greatest number of Varroa offspring. Second, we attempted to improve the rearing rates achieved with that method. The four methods tested included (1) rearing Varroa on honey bee pupae in gelatin capsules, (2) rearing Varroa on in vitro-reared honey bees, (3) group rearing Varroa on honey bee pupae in Petri dishes, and (4) providing Varroa a bee-derived diet. The number of reproducing females and the number of fully mature offspring were significantly higher in the gelatin capsules maintained at 75% RH than in any other method. A 2 × 3 full factorial design was used to test combinations of gelatin capsule size (6 and 7 mm diameter) and relative humidity (65, 75, or 85%) on Varroa rearing success. Varroa reproduction and survival were significantly higher in 7-mm-diameter gelatin capsules maintained at 75% RH than in those maintained in 6-mm capsules and at the other humidities. By identifying factors that influence Varroa reproductive success in vitro, this work provides an important foundation for the development of future rearing protocols.
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Acknowledgements
The authors would like to thank Dr. Amin Eimanifar and Tomas Bustamante for reviewing the manuscript in advance of submission. We gratefully thank Logan Cutts for managing the test honey bee colonies, as well as Brandi Simmons and Branden Stanford for providing technical assistance during the experiment (all Entomology and Nematology Department, University of Florida). This research was supported with funds provided by the National Honey Board to C. Jack and J. Ellis and a scholarship to C. Jack from The Costco-Apis Scholarship Program. The funding agencies were not involved in any aspect of the study.
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Jack, C.J., Dai, PL., van Santen, E. et al. Comparing four methods of rearing Varroa destructor in vitro. Exp Appl Acarol 80, 463–476 (2020). https://doi.org/10.1007/s10493-020-00488-0
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DOI: https://doi.org/10.1007/s10493-020-00488-0