Recently, a class instructor stated than it is not necessary to relocate a mating nuc if a barrier is placed in front of the entrance to force the bees to re-orient as they leave the hive. The theory being that if they cannot see directly out, they will re-orient as they depart. He also suggested a similar barrier would prevent robbing as the robbers fly directly into the entrance. A barrier that prevents direct flight is supposed to head off robbing.
I tried to combine both ideas by bending pieces of 1/2 inch hardware cloth to form a "L" in front of and above the entrance. It is wider than the width of the entrance. The inside of the hardware cloth is lined with plastic sign board. The combination prevents direct flight into the hive and direct sight out of the hive.
Does anyone have any experience with this approach?