Have you been watering the tree?
I have 3 river birches with the same problem the last 2 years.The local nursery told my to apply spray iron (fertilome). That seems to help temporarily. But the problem returns. It is only July and I have lost a good deal of yellow leaves already. There is no indication of insects. What is the problem?
We have a mature river birch with many yellow leaves surrounding it on the ground...and a powdery bit of sawdust at the tree line. I was told that it may be carpenter ants, and we'll definitely be checking this out further. Good luck to us all!
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