As I watched over lunch yesterday, a huge bumble bee flew into my weakest hive. The bee stayed less than 2 seconds and then flew out right where she came in. I don't think Bumble had time to rob anything but it was obviously the intention.
Bumble was the size of five of my bees put together. I just saw another bumble bee type bee although much smaller (about the size of 2 1/2 of my bees) but still with the round shiny bright black rear end fly toward the same hive but at the last second, flew under the SBB instead.
1. What would the bees in the hive have done when Bumble arrived to encourage the departure?
2. Does this mean that I should use my entrance reducer? I don't see any hives with those on them in my area.
Linda T in Atlanta