Help identify my yuzu tree pest
We live in sunny California and recently planted yuzu tree in our backyard. Right away we notice that the new leaves are eaten by pests. Originally we saw ants and we sprayed the tree. Ants are gone but something still eating my yuzu plant and the orange tree next to it. Mostly just the new leaves. The yuzu tree is small - maybe 3 feet high. The orange maybe 6 or 7 feet.
I've been watching the plants and see no evidence of caterpillars, leaf miners, or snails. We do have snail food as bait around the plants.
What could possibly be the culprit? Thank you in advance. Would love to post more pictures if needed.