“What is wrong with my birch tree? I am seeing some odd-looking patches on the leaves.” — Deb Schultz, Evanston The pinkish-red spots on your birch’s leaves appear to be erineum patches ...

It’s the time of year when yellownecked caterpillars will soon engulf unprotected river birch trees. These pests also feed on blueberry, hickory, maple and oaks, but I have only seen ...