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

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