Two of my Green Giant Arborvitae had the same browning. I cut the branches off at the trunk and immediately burned them. Not knowing what the problem was I bathed the tree in Sevin spray. I pulled all the mulch away from the base and burned that. I put fresh commercial mulch down and sprayed the tree and ground with a fungicide that I had. This was a desperation move since I didn’t want anything to happen to my bonsai conifers. As of yesterday the two trees look fine with no evidence of browning at all.We need closeup pictures but from these pictures it might be bagworms.
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