Growth of Cytospora abietis on Media Made from Dwarf Mistletoe-Infected and Uninfected Branch Tissues of Red Fir. Robert F. Scharpf, Plant Pathologist, Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, P.O. Box 245, Berkeley, CA 94701. Plant Dis. 67:656-657. Accepted for publication 22 November 1982. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1983. DOI: 10.1094/PD-67-656.

Cytospora abietis invades dwarf mistletoe-infected branches of red fir in the field more often than uninfected branches. Growth of the fungus on media prepared with dwarf mistletoe-infected branch tissues was compared with that on media prepared with uninfected tissues. Neither linear growth nor dry weight of the fungus differed significantly between the two media. Results indicate that autoclaved dwarf mistletoe-infected tissues of red fir contain no nutrients or other factors that favor growth of C. abietis in culture.