Is my austrian pine dying or just stressed?
Browning runs bottom-up and inside-out with stunted new candles and resin-soaked shoot tips, and the confirming sign is black pinhead fruiting bodies on the underside of second-year cone scales; Dothistroma looks different, showing brown to reddish bands across the needles with dead tips beyond the band, lower crown first. Normal autumn shedding of interior second- and third-year needles is neither of those, while a whole tree browning in a single season points at pine wilt nematode, which Morton lists as a fatal pest and which no treatment reverses.
Why austrian pine ends up on a quote here
Morton Arboretum lists Austrian pine as a Problem Plant and states plainly that it is not recommended for planting anywhere in the Midwest. A 15-year ISA study of landscape Austrian pines found Diplodia tip blight killed 84 percent of them and that trunk-injected fungicides made no significant difference, which is why the honest answer to "my pine is browning from the bottom" is usually removal and replacement rather than a treatment program.
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