bee escape is a general term for any device that allows bees to escape from a location into another, and generally not able to return. They are also used to get bees out of honey supers before harvest. Some actually fit into the oval hole in inner covers.
The one I use in the trap is called, a plastic "conical" bee escape, and normally used for the same purpose. You place a board with the escape in it between the honey supers and the brood chambers and as bees exit the honey supers through the escape, they cannot come back into the honey supers. I have never known anyone who uses them, but someone must, because there are different designs available in the bee supply catalogs.
No, it is not a problem to move brood without nurse bees. ( in fact, I don't recommend it) I have done it hundreds of times, never had a problem. Of course you would not want to move it at low or cold temperatures, but you can run the heater in your car if you have to. The brood can also be out for at least a few hours. I have had it out for 2 1/2 - 3 hours, no problem.
Moving nurse bees would not be helpful. And possibly detrimental. The object of the frame of brood is to draw the queen and the nurse bees from the feral colony into your trap. When you set one up you will see how fast the nurse bees, fanners, cleaners, rush into the trap as soon as the brood is introduced.
Hope this is helpful.
cchoganjr



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