They are working on it I believe, not sure it's something I would use in my
hives, but I read an article somewhere (bee journal?) working on entrance
reducers laced with varroacides to kill mites on entering bees.  

I saw that also,  it was called Varro gate.  Concepts was flea collar type
issue for bees.  It was actually mentioned as a miticide  so tougher to
balance the chemicals.
It was by Bayer,  but when I did research it seems it was just a teaser,
not a ready to try product.

Charlie

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