Re: pollen traps
I like and use this trap. It's a good design, keeps trash out of the pollen and the drawer can be mounted on either side which when using pallets is a plus.
The bees are pretty good about making sure they bring in enough pollen even with a trap. It doesn't trap it all. You will get a reduction in honey as more forgers go after pollen which leaves less for gathering nectar, but not a significant reduction. Some of my strongest hives had pollen traps...go figure.
Life is tough, but it's tougher when you're stupid.” John Wayne