Yellow and brown leaves on my aspen tree
I'm hoping someone can help me.
This spring we planted a 'Prairie Gold' aspen. I was hoping that it would do better in our climate because we do have hot summers but this summer has been relatively mild.
For the last couple of months or so, the leaves look like this!
From a distance the tree looks fine. The leaves are not drooping, they aren't falling off, but EVERY leaf is affected except one strange little cluster of three leaves which is okay. I have sprayed with iron chelate and some boric acid but these seem to have no effect. I can find no insects. Our soil is generally decomposed granite with a few small patches of clay, but in general has very good drainage. The entire bed surrounding the tree was amended with some compost.
Does anyone have an answer!