My young river birch have brown rusty edges on some of the lower leaves. It looks like a fungal infection, probably from the humid weather (and made worse when I water the lawn in the evening after work). I cut a few of the bottom branches off anyway to promote vertical growth, so that should get rid of a lot of the infected leaves. I'm also going to spray fungicide on the entire tree to hopefully prevent it from getting out of hand before Fall.
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| Looks like rust, or advanced leaf blight, a fungal infection on the leaves from humid weather and watering in the evenings |
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| It's spreading! Only on the lower branches so far. The new leaves at the ends of the branches are fine, and the upper leaves look okay. |
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| Brown spots with a yellow halo, looks like a sure sign of leaf blight |
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