Hi Douglas County Master Gardeners,

Question #0026831 has been assigned to you by CSU E.

Tree Issues

I have two Austrian Pines in my backyard. Over the past two springs, many of the same pine tree (throughout the neighborhood) needles have been turning brown. These brown needles are mostly at the top of the trees but still other areas have been impacted as well. In the spring of 2020, the area in and around Parker had a huge temperature swing (loss of 60-70 degrees within hours) and many of our Ash trees and Austrian Pines took a beating. Looking at the affected needles and reading articles, I am thinking the pines may have Dothistroma needle blight. If this is the case, what can I do to save the trees? Also, my Ash tree only grew leaves on one section of the tree the past two years. Again, the temperature drop I spoke of affected numerous Ash trees in my neighborhood. What needs to be done with my Ash tree?

From: TERRY TERRILL
Submitted: 06/17/2021 6:15 PM

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Hi Terry

Thank you for contacting the Colorado State University Extension Master Gardener program.  We have received several inquiries asking the same question that you  have.  Attached is the response that we have been sharing with folks regarding this question:

forwarded article :https://www.9news.com/article/weather/weather-colorado/cold-temperature-swings-damage-colorado-evergreens/73-c00426f8-9130-44e4-b3c7-77e88e519f40: from CSFS. 

With regards to the ash tree, there have been all kinds of inquiries about this issue too.  It is difficult to thoroughly diagnose the issues without  a photo to look at.  It could be a bug problem, fungus  or something else.  I have attached a copy of a couple of reference articles about your issue.  I hope this helps.  If you still have questions, please feel free to write back and please submit a photo.

https://nfs.unl.edu/documents/EAB/ashdeclinediseasesfullsheetfinal.pdf

file:///C:/Users/mgardener.DCGOV/Downloads/SUL21%20(4).pdf

Thank you for contacting us.

Colorado Master Gardeners of Douglas County

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On Fri, Jun 18, 2021 at 9:20 AM Ask Extension <<personal data hidden>> wrote:

Hi Douglas County Master Gardeners,

Question #0026831 has been assigned to you by CSU E.

Tree Issues

I have two Austrian Pines in my backyard. Over the past two springs, many of the same pine tree (throughout the neighborhood) needles have been turning brown. These brown needles are mostly at the top of the trees but still other areas have been impacted as well. In the spring of 2020, the area in and around Parker had a huge temperature swing (loss of 60-70 degrees within hours) and many of our Ash trees and Austrian Pines took a beating. Looking at the affected needles and reading articles, I am thinking the pines may have Dothistroma needle blight. If this is the case, what can I do to save the trees? Also, my Ash tree only grew leaves on one section of the tree the past two years. Again, the temperature drop I spoke of affected numerous Ash trees in my neighborhood. What needs to be done with my Ash tree?

From: TERRY TERRILL
Submitted: 06/17/2021 6:15 PM

To view/respond to the question, please login.

---

Please join the Ask Extension Experts group in Connect Extension. We will use that group to post updates about Ask Extension.
This message was sent by Ask Extension. If you need help, please visit https://askhelp.extension.org/.