Knowledgebase

Eastern Red Cedar/Juniper Dying #878565

Asked July 24, 2024, 12:40 PM EDT

Hi, I could use advice on how to save/help the large 50 foot Eastern Red Cedars and a smaller juniper tree that have dropped significant amounts of their foliage. The birds and hornets love these trees. My neighbors and I have been fighting a family of ground hogs which I suspect may have caused damage to the root system of at least one of the trees. I have also seen a lot of webbing all over the branches (occasional bag worm cocoon sightings but nothing significant). The branches are so sparse you can see up to the tops of the trees from the base. Another thing that happens is orange apple rust. I know this alone doesn’t harm the trees but combined with the other issues I wonder if it has weakened them and the pests are able to cause more damage. The bark is falling off the large cedars. At first I thought this was deer/fox/ground hog damage so I put chicken wire around the tree. That didn’t seem to help. Should the large cedar die and fall there could be significant property damage. A certified arborist came out two years ago and her assessment was that it would not fall within a year. She said to keep an eye on the lean of the tree due to the loose soil at the roots and high winds that come through the yard (property is at the top of a hill). What are my first steps? I have not done any sort of fertilizer or spray on the trees since I bought the house in 2019. I have tons of photos. I selected photos that showed the dieing branches and how sparse they foliage is. Unfortunately I wasn’t able to trim the smaller juniper due to recovering from back surgery. I usually trim it back each year. Thank you! Michelle

Baltimore County Maryland

Expert Response

We would not recommend that you keep trimming the smaller tree, if possible, since eventually that will lead to more bare branches since pruning would be removing the only growth capable of replacing needles.

As for the mature trees, it is difficult to say what is going on. A second opinion from another arborist might be worth getting. (The link will allow you to search for some in your area.) We can't see the site conditions surrounding the trees, and we don't know if anything happened to their root zones (maybe construction or utility digging) before you took over the property in 2019. Root damage and other stressors can take a while to manifest as canopy dieback, especially with evergreens.

Even if there is some rust, nothing can be done to cure it, nor would any other pesticide be warranted as far as we can tell from the photos. If there are any borers in the trunk,  no insecticide would remedy that situation anyway. Decline is often tied to root health, but we can't really get more specific with a diagnosis since the symptoms aren't really characteristic of a particular issue.

Sorry we don’t have more detailed information to give you. If you get a second opinion from an arborist then feel free to share their report and we can help give guidance or clarify any of their suggestions. 

Emily

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