Leaf Deformation on Tree Lilac

Asked May 6, 2013, 9:28 PM EDT

We have a JapaneseTree Lilac and for at least a couple of years have had trouble with something that causes leaf curl and leaf deformation. Looking at the leafs with a 10X loupe, I can't see any bugs, but the problem really looks like some sort of bug. The tree's planted in soil with a 7.8 pH, but the tree lilacs are supposed to be tolerant up to a pH of 8.0. It's possible it's soil-related, but I'm still leaning toward a bug of some type.

Montrose County Colorado

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