This is what's happening to the leaves. They seem to be curling up. I can't see anything in the curled leaves. Some of them are turning brown. I'm not sure what's happening.
This is especially irritating to me because this seemed like it was going to be our first year having plums. They're already about half the size they were by October of last year, and already have more color.
I don't know how to get rid of the ants, or for sure if they're causing damage to the tree, or if it is going to damage the plums...Another thing to research!
Update: I was wrong. Inside the curled leaves were aphids that appear to be just hatching. Not that that helps me. I know nothing about the buggers, or how to deal with them. Or what needs getting rid of. Aphids, ants, both?