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Pythiaceous Fungi Isolated from Southern Forest Nursery Soils and their Pathogenicity to Pine Seedlings

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Pythium irregulare-debaryanum, P. sylvaticum, P. spinosum, P. helicoides, P. splendens and Phytophthora cinnamomi were isolated from soil in forest nurseries in the Southeastern United States. These fungi caused post-emergence damping-off of seedlings of Pinus echinata, P. elliottii, and P. taeda in greenhouse tests. Necrosis of feeder roots in surviving seedlings resulted in a reduction of the root and shoot systems. P. echinata was most susceptible to damping-off, followed by P. taeda and P. elliottii. Susceptibility to feeder root necrosis varied with the species of Pythium tested.

Document Type: Journal Article

Affiliations: Principal Plant Pathologist, Forestry Sciences Laboratory, Southeastern Forest Expt. Sta., Forest Service, U.S. Dept. Agric., Athens, Ga.

Publication date: September 1, 1968

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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