Re: does a used queen cage attract bees in a swarm trap?
I had three swarms land in the same tree in exactly the same spot over a months period of time last year. Being curious about the exactness of this location I started looking around for clues as to why. I found everything from leah lines to it is not really all that uncommon for a beekeeper to pretty much know on what limb of what tree a swarm might cluster. Some of the comments suggest that it is the odor left behind from the previous swarm / Queen that attracts the next swarm to that spot. Tossing out the extremes such a hokus pokus and random chance. I find this the most likely explanation.
Significant Minority vs Insignificant Majority, 20% of causes produce 80% of the effects.