Wasps On Hummingbird Feeder. The problem is that a feeder taken over by bees and wasps become unattractive to hummers, and they eventually stop coming altogether. Natural ways to keep bees and wasps off hummingbird feeders having ‘bees’ at one’s feeders can often just mean that there are swarms of wasps, bumblebees, yellow jackets, and hornets, and if there are enough of them, they can even scare the hummingbirds away.
Hummingbird nectar is mixed as a 4:1 solution, so be sure the wasp nectar is far sweeter. Hummingbirds' tongues are twice the length of their beaks so they have no problem reaching the bottom of the feeder. You’ve probably seen bees and wasps hovering around your hummingbird feeder more than once.
Set up a wasp trap, which will focus their attention away from the feeder.
This is generally long enough for bees and wasps to forget about the feeder. If your hummingbird feeder has any yellow on it, wasps will swarm. If you want to keep wasps away from your hummingbird feeder, be careful with colors. If you wipe the outside of your hummingbird feeder, you will prevent them from sensing as much of the sugar.