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Diseases of Douglas-Fir Seedlings Caused by Fusarium oxysporum. W. J. Bloomberg, Forest Pathologist, Forest Research Laboratory, Canadian Forestry Service, Department of Fisheries and Forestry, Victoria, British Columbia, Canada; Phytopathology 61:467-470. Accepted for publication 14 November 1970. DOI: 10.1094/Phyto-61-467.

Isolates of Fusarium oxysporum were obtained from roots of Douglas-fir seedlings without disease symptoms or with one of the following diseases: postemergence damping-off, root rot, or corky root. Isolates varied in infectivity, pathogenicity, types of disease they caused, and their ability to kill seedlings of different ages. Pathogenicity was greatest in seedlings growing in nutrient agar, intermediate in sterile nursery soil, and lacking in sterile peat-sand mixture.