I have a mandarina (tangerine) in a pot on my roof, it has been fine until lately and the leaves started to curl on part of the branch. I don't see any bugs on the leaves they just curl up tightly. My handyman said he thought it was from ants, so I put some ant bait in the plant. It may have helped, the leaves don't seem to be curling in new places but I can't be sure. If it is better, it is a very slight change. I do think the ants that were always around the tree have moved on, I don't see them anymore.
Here's a picture. I'd love some ideas on what it could be.
