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Yes, Occam, that's correct. And if you leave that frame until it's capped and then remove it, you'll trap a lot of the varroa in that frame, since there is no other brood in the hive. I've done this several times, although I've had some problems with my setup. A few years ago when I first tried this, they didn't make frame isolation cages for mediums (I use all 8-frame mediums), so I took a plastic queen excluder, cut it into pieces, and used them to isolate 2 frames up against the wall of a brood box. So I had a 2 frame wide QX piece on the top of the brood box, an identical piece on the bottom of the brood box, and then a piece that I would slide in vertically between frames 6 and 7, surrounding frames 7 and 8 in QX material. The problem was that I had queens escape this makeshift isolation frequently, since my vertical piece didn't fit the box perfectly. Also, some of my bees display hygienic traits, where they pull brood that is very infested with varroa, and with those colonies, I could never get them to fully cap the frames, because they'd pull the bad brood and the queen would re-lay, so the brood wasn't all the same age. I haven't done a "trapping treatment" (that's what I call it) in the past year or so because of these problems. But I'm thinking about getting an isolation cage at some point and then trying it again.
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