Meikle WG, Sammatoro D, Neumann P, Pflugfelder J (2012) Challenges for developing pathogen-based biopesticides against Varroa destructor (Mesostigmata: Varroidae) Apidologie 43 (5): 501–514. http://link.springer.com/article/10.1007%2Fs13592-012-0118-0