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In Vitro Rearing of Solitary Bees: A Tool for Assessing Larval Risk Factors
Published on: July 16, 2018
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Comparing four methods of rearing Varroa destructor in vitro
Cameron J Jack1, Ping-Li Dai2,3, Edzard van Santen4
1Entomology and Nematology Department, University of Florida, Steinmetz Hall, Natural Area Dr., P.O. Box 110620, Gainesville, FL, 32611-0620, USA. cjack@ufl.edu.
Experimental & Applied Acarology
|April 7, 2020
Summary
Developing an in vitro rearing method for the parasitic Varroa destructor mite is crucial for honey bee research. Gelatin capsules at 75% relative humidity with 7mm diameter significantly improved Varroa reproduction and survival.
Area of Science:
- Apiculture
- Pest Management
- Invertebrate Reproduction
Background:
- The parasitic mite Varroa destructor poses a significant threat to managed honey bee (Apis mellifera L.) colonies globally.
- Effective control strategies are hindered by the lack of year-round research capabilities due to difficulties in rearing Varroa mites outside of live hosts.
Purpose of the Study:
- To establish an effective in vitro rearing method for Varroa destructor mites.
- To identify optimal conditions for Varroa mite reproduction and survival in a controlled laboratory setting.
Main Methods:
- Four distinct in vitro rearing methods were evaluated: honey bee pupae in gelatin capsules, in vitro-reared honey bees, group rearing on pupae in Petri dishes, and a bee-derived diet.
- A 2x3 factorial design tested gelatin capsule size (6 and 7 mm) and relative humidity (65%, 75%, 85%) to optimize rearing conditions.
Main Results:
- Rearing Varroa destructor mites in gelatin capsules at 75% relative humidity yielded significantly higher numbers of reproducing females and mature offspring compared to other methods.
- Optimal conditions for Varroa reproduction and survival were identified as 7-mm diameter gelatin capsules maintained at 75% relative humidity.
Conclusions:
- The study successfully identified key factors for successful in vitro rearing of Varroa destructor mites.
- This research provides a foundational protocol for developing consistent, year-round Varroa mite rearing, essential for advancing pest control strategies and supporting honey bee health.
