Verticillium albo-atrum on Ceanothus in a California Forest. T. C. Harrington, Assistant Professor, Department of Botany and Plant Pathology, University of New Hampshire, Durham 03824. F. W. Cobb, Jr., Professor, Department of Plant Pathology, University of California, Berkeley 94720. Plant Dis. 68:1012. Accepted for publication 25 July 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/PD-68-1012.

Verticillium albo-atrum (dark mycelial type) was found to be the cause of a lethal systemic xylem infection of Ceanothus integerrimus on a relatively cool coastal forest site in an area with no history of cultivation. This report is apparently the first for Verticillium wilt on Ceanothus spp., the first on natural forest vegetation in western North America, and only the second of V. albo-atrum in California.