Is my black walnut dying or just stressed?
Small brown spots appearing on the underside of the leaflets in late July, followed by August defoliation, is walnut anthracnose — ugly, routine in wet Indiana summers, and not fatal. Genuine decline is branch flagging and dieback that starts in the top and outer crown, repeats the next season, and leaves gaps that never refill in spring.
Why black walnut ends up on a quote here
This is the most common removal request that has nothing to do with safety — it is about nuts, stains, and the plants that will not grow under it. Juglone in the roots, hulls, and buds kills or stunts tomatoes, peppers, potatoes, rhododendron, blueberry, and peony, and Purdue puts the typical toxic zone at 50 to 60 ft from a mature tree, with occasional injury out to 80 ft.
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