aaa, I think this leaf damage is not from leafcutter ants, but from Leaf cutter bees (Megachilidae). Bee damage is very regular, always with the same size: circles or ovals, in contrast ant damage is most of the time irregular
http://buginfo.com/article.cfm?id=103
http://www.richard-seaman.com/Insects/CostaRica/LeafcutterAnts/LeafcutterAntWorkersCuttingALeaf.jpg.
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