Some root rots are due to Armillaria sp. as on this Cupressocyparis leylandii.
OSU Plant Clinic Image, 2016.
This young cypress tree had tip dieback due to infection of and rotting of the roots due to both Rhizoctonia and Fusarium.
Oregon State University Plant Clinic image, 2020.
See:
Cedar, Port Orford (Chamaecyparis lawsoniana) - Root Rot
Notes: Several pathogens can cause root rots of cypress in the PNW including Phytophthora spp. and Armillaria sp. as on Cupressocyparis leylandii. A Fusaium sp. has been reported for Oregon.
