Hi, I have 2 Moonrise Japanese Maple trees that I purchased and repotted last year. Both of them leafed out and were looking beautiful this spring. Three days ago one of the trees had several branches and leaves begin turning brown and curling up. I don't see any insect pests on the trees. I've been using a moisture meter to determine when to water the trees. I wait until the moisture level is down to 1-2 on the meter, then water thoroughly and pour off any water remaining in the tray under the pots. Last year one of the trees was in an area with too much sun and the leaves scorched, but this does not look like that. The tree that is affected is in a location with morning sun, then afternoon dappled shade or shade. It's about 15-20 feet away from the second tree, which is so far not affected. Can you identify what is going on and what I should do about it? Many thanks! Sally Bornstein