MB: Thanks much for the link to a drone trap --- I think this is what I need for limiting the unwanted drones during mating and these appear easy to make. If all I had were queens producing drones with the varroa resistant genetics, I would not need to trap the "bad" drones. But, out of 10 hives maybe 4 have the needed mite resistance. Out of the 4, after very careful analysis of how they are handling the mites, I will graph queens from 2. To the extent possible, these virgin queens will be mated with the feral drone population which appears to be thriving in spite of the varroa mites, etc.
In case anyone doesn't know about this, there is a new iPhone/ipad app that maps the location of feral hives. I found a link to a web site regarding this subject on the NCSU Apiculture site discussing Dr. Delaney's project. The link is www.SaveTheHives.com. The app author is Ronnie Bouchon, a friend, but I have not financial interest.