Laying towels over the top bars of single brood box colonies has not really touched the blighters for me either, but hanging cardboard strips (I've been trying different types and have settled on cut up cereal packets as seeming to do the trick) on frames bordering the nest as the colony expands in the spring seems to be very effective, most of the strips are chewed up in two to three weeks in my experience and I've struggled to find varroa afterwards, by drone fork or the shaky pot thing, apart from one or two colonies which for some reason I cannot fathom the varroa has still got hold.
Bookmarks