I am cutting down an old, unproductive pecan tree and went to lunch.
Now that I am back, I am having to work around busy workers on the ends of all cut logs. There is a pond across the road, so I am assuming they are after the pecan sap for propolis. It's barely 57 degrees out here.
I had a home made sawmill and there were times when the bees would be thick on the logs as well as the sawdust pile.
Most sap is somewhat sweet, even if watered down. You probably could have made some syrup...
Aphids work on Pecan and Black Walnut and the bees work the "honey dew" the aphids produce. I have heard bees in both Pecan and walnut trees that sounded like a 747 taking off. A master beekeeper in our club said this makes bad tasting honey.
A friend of mine would tap the local maples here like the northern people tap for maple syrup. He would then feed the sap to his bees before anything bloomed in the spring.