I don’t remember having this problem last May, but this year the bees have discovered my hummingbird feeder. Not all three feeders, just one with yellow flower openings.
I tried several potential solutions for the problem and the following did not work:
1. Take the feeder down for several days.
2. Paint the yellow flowers red with nail polish (someone suggested that bees are attracted to yellow?)
3. Move the feeder location10 ft. (Do the bees smell the sugar solution?)
None of those actions deterred the bees here.
Then I read that bees can not hover and feed as hummers do and that a light spray of oil will not allow bees to land. Some suggested pan spray and others said any oil spray would work. Negatives about this idea are that hummers could get the oil on their feathers. I decided to try the oil and it does keep the bees away, so far.