Save some of the goo from a slimeout, freeze it and put about a TBS in the oil pan. I use a small cup like dressing is served in a restaurant in the oil pan, as bait. it seems to draw the SHB. I think it will work in every 5 or maybe 10 hives if they are fairly close together/ I haven't tried it like that because I only have a few hives now and I can use the oil pan on all the hives. The last time I worked more than a hive or two, I only saw 4 SHB in the first six hives.