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Dieback of Carrot Roots Caused by Pythium debaryanum. F. D. McElroy, Research Scientist, Canada Department of Agriculture Research Station, 6660 N.W. Marine Drive, Vancouver 8, British Columbia; H. S. Pepin(2), and D. J. Ormrod(3). (2)Research Scientist, Canada Department of Agriculture Research Station, 6660 N.W. Marine Drive, Vancouver 8, British Columbia; and (3)Plant Pathologist, B.C. Department of Agriculture, 17720-57th Avenue, Surrey, B.C. Phytopathology 61:586-587. DOI: 10.1094/Phyto-61-586.

Pythium debaryanum was consistently associated with a root die-back disease of carrots grown in muck soil in the field. Laboratory tests proved this fungus to be pathogenic to carrot. In a field survey, the loss of crop due to Pythium root die-back was estimated to be approximately 35%. A similar survey showed that nematodes were not involved.