Why are my Techny Arborvitae branches turning brown and the trunks split? I...

Asked July 24, 2014, 11:29 AM EDT

Why are my Techny Arborvitae branches turning brown and the trunks split? I planted a treeline 3.5 years ago that are techny arborvitae. The treeline has thrived and put on a lot of growth. I have noticed that 3-4 of the trees are getting very brown and appear to be dying. All the other trees appear dark green and healthy. When I pulled the branches apart to see what the problem might be, I noticed that the trunks of those limbs are cracked down to the wood. Is that the problem? What would have caused this in just a few of the trees? I did lose a couple of evergreens last winter because of the severe cold. I have never fertilized any of the trees, but make sure they are watered regularly and do not go into the winter dry. What is causing this problem?

Wright County Minnesota

1 Response

We feel this is winter damage (perhaps snow load). And, yes it can be a problem as any opening in the bark can allow pathogens a entry point. Prune out the dead wood and continue what you are doing.