Re: Seeley's Darwinian Beekeeping Article
The first couple of year that I kept bees, I had major robbing problems. I finally built some very nice robber screens and left them on from spring through Fall. The design was such that the screens blocked the robbers without impeding the home bees.
I no longer use robbing screens. Instead, I monitor the traffic at the hive entrance, and I adjust the entrance size so that it is always a little crowded. The entrance is small when the hive population is small, and the entrance is bigger when the hive population is large. The entrance is about two bees wide in the winter and early spring. It gets opened to about 2" wide about 3 weeks after our first blooms start. It goes to about 4" wide about the time I am putting on the second honey super. Etc. When the entrance is properly scaled to the size of the hive population, even the smallest hive can defend itself from robbing, and I have never had a robbing problem since using this method.
(6th year, 13 hives, Zone 5b, 5500')