Interesting studies in use of double stranded RNA by James Masucci on killing varroa. Its a technique that is in it's infancy but has the possibility to be a game changer. You specifically block an essential biochemical pathway in your parasite of choice that has no effect on the host. Currently the method of application is adding the DSRNA to sugar solution fed to bees. Interesting results suggest it's doing well, up there with Apivar, but a long way to go.
Research is conducted my Monsanto, everybody's whipping boy.
I think it is a very clever move as the technology (when/if perfected) has the potential to solve plant/pathogen problems without needing pesticides and a nice positive spin with bees being involved. Very clever marketing.