What's wrong with my quaking aspen?

Nature Talk
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20250728_100443
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I live in Fort Smith Montana (south central) and I have 2 quaking aspens 1 is fine nice dark leaves. The other one ls 50ft away. They are on the same watering schedule. The soil is sandy w/clay and small pebbles. 2 years ago we fertilized and not any better. Ideas?

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Can you add a pic of the regular leaves of the other tree? Not that I can be of much help; my knowledge is mostly on animals, but maybe this can help others figure this out.

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Did you upload to Inat? You can identify it as Populus tremuloides and ask in the notes what is wrong with it.

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You might ask your local Agricultural Extension Service. They’ll usually know if there’s some common problem or pathogen with the landscaping plants in an area.