Microbiota decussata-Root Rot

Microbiota decussata (Russian cedar) with die-back due to Phytophthora root rot.

Progression of foliage symptoms displayed by Microbiota decusatta (Russian cypress) when infected by Phytophthora lateralis, showing initial bronzing of foliage (center) followed by plant death (left).

Heavily (left) and moderately (center) infected root systems show the extent of root necrosis attributable to Phytophthora lateralis. The plant on the right is healthy.

Infection of young Microbiota decusatta by Phytophthora lateralis causes both stunting and reduced root mass.