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.
![brown edge river birch leaves brown edge river birch leaves](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhhfnn0sdq6Hi6whilYIDT42EZe6dxaqxCuyUozwGnvi_Y6m9MjWSRKoBUQ_lpMNTeT1JbtOVM31bh8yLE5x4u50hOLwJGnaAssBs7TrHwXKXpYvUXwFVDjSea-m_r-v7i5Ez7WKzboTP0/s640/river+birch+fungus.JPG) |
Looks like rust, or advanced leaf blight, a fungal infection on the leaves from humid weather and watering in the evenings |
![brown edge river birch leaves brown edge river birch leaves](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiSo9-VGiDE1K5lIgB8CPjdEfoV0ZgSv8Ffe9nG0_onMarWBU-rJMLdRop2KIOYWmkCrr19-HMOZb1Ul1SvfTlEbqgZtMCwPN7dXt5ywMfsdZazdBcAeVP9ZoOo-MM4x0ps38Y73VAnOEY/s640/brown+edge+riverbirch+leaf.JPG) |
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. |
![brown edge river birch leaves brown edge river birch leaves](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh5F4QFH8KF5ARPuXXNA6vvCFVmK5j77z-O-LinpIBo9lG0qq3qrrGSGknikFDIx1aC4lYtvXFrMXbUBaKRqObB2Pz2FiIXnGZdqFWRhaslZ1cqR1Ibh8oDjTeIR_KKcunSuRqeiVIWAvg/s640/river+birch+leaf+fungus.JPG) |
Brown spots with a yellow halo, looks like a sure sign of leaf blight |
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