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Selective Soil Fungicides as an Aid in the Identification of Soil-Borne Plant Pathogens. W. A. Haglund, Associate Plant Pathologist, Department of Plant Pathology, Washington State University, Northwestern Washington Research and Extension Unit, Mount Vernon, Washington 98273; R. L. Gabrielson(2), and D. R. Tompkins(3). (2)Associate Plant Pathologist, Department of Plant Pathology, Western Washington Research and Extension Center, Puyallup, Washington 98371; (3)Assistant Horticulturist, formerly Washington State University, Western Washington Research and Extension Center, Puyallup, Washington, now Associate Professor, Department of Horticultural Food Science, University of Arkansas, Fayetteville, Arkansas 72701. Phytopathology 62:287-289. Accepted for publication 27 September 1971. DOI: 10.1094/Phyto-62-287.

The employment of specific soil fungicides confirmed that Pythium ultimum is the primary pathogen causing pre- and postemergence damping-off and reduction in yield of cucumbers in western Washington. Dexon (p-dimethylaminobenzenediazo sodium sulfonate) and Lanstan (1-chloro-2-nitropropane) were equally effective for disease control, whereas the incidence of disease was consistently higher in the Terraclor (pentachloronitrobenzene)-treated plots than in the nontreated control.