Pollen is the obvious one of course.  Bees coming from the Himalayan Balsam look like ghosts and I wonder whether the pollen of that plant carries a charge to attract it to bees' bodies.  

There is an anti Varroa product called Exomite apis. It consists of 80% Entostat powder and 20% powdered thymol.  In use you put it in a plastic tray which is supplied as part of the kit and restrict the entrance so the bees have to walk through it. The powder is attracted to them electrostatically and in the mutual grooming process the thymol gets distributed throughout the hive population. I don't know whether it is the grooming or the thymol that does the trick.  It's not the perfect solution but it's one more tool in the box


.

Chris



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