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Notes: Root Grafting of Port-Orford-cedar--An Infection Route for Root Rot

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Hydraulic excavation of the upper root systems of 5 groups of trees in a nearly pure, 50-year-old stand of Port-Orford-cedar disclosed abundant intraspecific root grafting. Tree roots on a sizable area are intergrafted to form an almost continuous root network which serves as a path for vegetative spread of Phytophthora lateralis. Frequency of grafting decreases in a straight line relationship with increase in distance between trees. Forest Sci. 22:276-278.

Keywords: Chamaecyparis lawsontana; Phytophthora lateralis; tree spacing

Document Type: Miscellaneous

Affiliations: Professor of Forest Pathology, Oregon State University, Corvallis, Oregon 97331

Publication date: September 1, 1976

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