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Advice for larger stand of spruce in Central Denver #814830

Asked October 21, 2022, 11:54 AM EDT

Hello my client has a large stand of spruce that are looking very stressed, and one that is looking very healthy. I went over and inspected the trees and the surrounding. The base of one of the more unhealthy looking trees, had plastic landscaping under it, which I ripped out and found a little white mold nothing crazy but still saw some. The other trees had some plastic bags pilled on the root flare and I removed those and saw a some more mold/white spores. The root flare were all exposed and the base of the tree had pretty thick needle build up from over the years. This whole area has not been irrigated well and the soil was very dry and I think the main culprit here is heat stress and lack of moisture. There is evidence of beetler activity with micro pin holes in all the trees trunk bark, not excessive pitch coming out any where. No frass on the ground...Just a bunch of dead branches with obvious engraving marks. The client is worried about the healthy spruce trees on the property becoming effected from the stressed out spruce trees. Which will be VERY expensive, so the goal is to come up with a plan to try to baby the stressed trees, remove the few trees that are beyond repair. Which brings us full circle to the genesis of this very email folks. I need some advice. I suggested that we remove the really bad tree/s, cut out the deadwood on the stressed trees, clean out the base/root areas, add some mulch, increase water, and in the spring I come in and deep root fertilizing with Rainbow tree care Bio Rush( no nitrogen). I'd like your input on tweeks or a new full blown plan. Thanks in advance! first time using this resource!

Denver County Colorado

Expert Response

The problem you describe and the pictures reflect a common situation occurring in the Denver and surrounding area.  The drought conditions we have been experiencing over several years is taking a significant toll on all trees, even larger trees.  Without extra watering throughout the year - trees just can't survive.  The plastic under the trees was most likely a contributor to the problem.  Pestserve Lists associated with Colorado State University is an excellent resource.  You can post your question on the site.  Many experienced arborists and research scientists use this site to exchange information and share their findings. 
https://lists.colostate.edu/cgi-bin/mailman/listinfo/pestserv-l
Colorado Master Gardener, Denver County Replied October 22, 2022, 5:09 PM EDT
Hey thanks for the reply. I posted on pest serve. Appreciate your time 

Kelly 

On Oct 22, 2022, at 3:09 PM, Ask Extension <<personal data hidden>> wrote:

The Question Asker Replied October 25, 2022, 11:43 AM EDT

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