Should I remove or save my austrian pine?
Austrian Pine is on the hazard list here, which shifts the odds toward removal. 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.
How to tell which one you've got
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.
The structural question
Zimmerman pine moth is the structural problem — larvae tunnel at the branch whorls, leaving popcorn-like masses of pitch at the trunk union and weakened whorls that snap out under wind or ice. On top of that, Diplodia leaves years of brittle dead tips standing in the crown, and a 50-60 ft evergreen crown loaded with freezing rain puts real weight over whatever sits beneath it.
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