I've also heard that European honey bees prefer the 10 gallon swarm trap over the 3 gallon swarm traps that Dadant and others sell. And with the proper sized swarm trap AND with a swarm lure, it seems that you can't lose, right? (Yeah, right...)
Seriously, I've read before that while smaller traps *can* be used, more success with European bees can be had with larger traps. (African bees, on the other hand, preferred the SMALLER traps of approximately 3 gallon size.)
It should also be noted, the ideal height of the traps seem to be between 10' and 12' feet.
12' feet up, 10 gallon trap AND swarm lure? It seems IMPOSSIBLE to lose a swarm to the trees, right? (Again, yeah, right...)
This year, unless I just happen across some 10 gallon peat pots, I'm just going to use cardboard nucs, placed 10' feet up in a tree, with swarm lure, about 50' feet away from my most "swarmy" hives.
Unless anyone has a better idea, wish me luck!