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Black Hills Spruce dying #788935

Asked May 02, 2022, 2:29 PM EDT

Black Hills Spruce trees turning brown from the inside out and from the bottom up. I'm pretty sure it is rhizosphaera needle cast. Can you confirm?

Hillsdale County Michigan

Expert Response

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Sent: Monday, May 2, 2022 2:30 PM
To: Miller, Laura <<personal data hidden>>
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Dear lmiller,

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YOUR QUESTION #0058866:

Black Hills Spruce dying

Black Hills Spruce trees turning brown from the inside out and from the bottom up. I'm pretty sure it is rhizosphaera needle cast. Can you confirm?

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The Question Asker Replied May 02, 2022, 2:38 PM EDT
Hi Laura,

It certainly looks like it. One of the identifying characteristics is the fungus that can be seen growing out of the stomata (gas exchange openings on the underside of the needles). If you look close, you'll see black dots on the underside of the needle. 
This is the best resource that I know of for rhizosphaera needle cast:
https://extension.umn.edu/plant-diseases/rhizosphaera-needle-cast

Thank you,
Julie
Julie Crick Replied May 05, 2022, 12:46 PM EDT

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