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Etiology

Brown Sapwood Stain of Ponderosa Pine Caused by Cytospora sp.: Cultural and Histological Aspects. J. D. Rogers, Departments of Plant Pathology and Forestry and Range Management, Washington State University, Pullman 99163; A. F. Noskowiak, Departments of Plant Pathology and Forestry and Range Management, Washington State University, Pullman 99163. Phytopathology 66:25-27. Accepted for publication 7 August 1975. DOI: 10.1094/Phyto-66-25.

Cultural characteristics of a Cytospora species causing brown sapwood stain of ponderosa pine are described in detail. The fungus primarily decays ray parenchyma and produces a diffusing pigment that stains longitudinal tracheids and associated wood elements. The Cytospora sp. is similar or identical to one discussed by earlier investigators.