I just got a hummingbird feeder this week. I have to admit I bought it based on coolness rather than practicality, because I know nothing of feeders. It is made to mount on a wall with a small vase that is on a hook at the bottom of a fancy copper wire thing.
I mounted it on an arbor I have in an area where I have seen the hummingbird. Now it has been over run with fire ants on day 2. I spread some fire ant stuff on the ground underneath.
I am critical of spreading petroleum jelly or other sticky stuff because I have seen what happens to a bird that hits flypaper hung outside. It was pretty bad.
You could make an ant moat to place between the hook and the feeder. The moat would be filled with water and ants will hesitate crossing it (although sometimes swarms sacrifice themselves to make a bridge).
Still... if you can find a lid to a wide jar (I've used a plastic Maxwell House instant coffee lid), you can try making your own - punch a hole in, thread the hanger through the hole, seal around it with some clear aquarium sealant, fill with water, and finally re-hang the nectar resevoir on the hook below the moat. Hopefully that will keep many of the creepy crawlies (at least the non-fliers) away from the feeder port.
