Hey Joe,

I just happened to have watched a video featuring the use of one of these
'swarm catchers'... perhaps this can answer your question [might want to
skip into ~3:30]:

http://www.iwf.de/iwf/res/mkat/metafiles/04000029460220000000_lo.asx

Video presented here:
http://preview.tinyurl.com/37kq6k

>"Particularly, if it interfered with hive functions such as hindering 
>foragers from exiting the colony or drones."

It seems to me that these would've been employed only when the swarm began
to issue from the hives and removed shortly after - rather labor intensive!


- Mike

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