VIEW ARTICLE

Tolerance of Polyporus amarus to Extractives from Incense Cedar Heartwood. W. Wayne Wilcox, Assistant Forest Products Pathologist, University of California, Forest Products Laboratory, Richmond, California 94804. Phytopathology 60:919-923. Accepted for publication 11 November 1969. DOI: 10.1094/Phyto-60-919.

Polyporus amarus causes a brown pocket-rot in heartwood of living incense cedar (Libocedrus decurrens) trees. It and two other brown rot fungi, Poria monticola and Lentinus lepideus, were grown in liquid culture containing malt extract and various fractions of incense cedar heartwood extractives. P. amarus had a relatively high tolerance for all fractions. Growth was stimulated by low concentrations of most of the fractions. Such tolerance may be a factor in the unusual ability of P. amarus to degrade this highly decay-resistant wood.