Abstract
A serious root rot disease of Chamaecyparis attributed to a species of Phytophthora has been reported from the Pacific Northwest (2) (3). The fungus attacks all sizes of trees, and is especially destructive to established landscape plantings of specimen plants or hedge rows. The disease is known to occur in Oregon and Washington, and since it apparently has been present for sometime before its nature was recognized, the fungus has probably been widely distributed. The disease can readily be mistaken for transplanting injury, and hence it could be present but not recognized. A description of the disease, the establishment of a new species of Phytophthora as the causal organism, and proof of the pathogenicity of this fungus are given in this report.
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