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Survival and Pathogenicity of Phytophthora Cinnamomi in Several Western Oregon Soils

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Survival of Phytophthora cinnamomi in forest soils in bottles, as measured by successful reisolation, dropped steadily during the first 6-months following inoculation, and remained nearly constant at a very low level up to 19 months, after which it could not be isolated. Frequency of recovery was greatest in agricultural soil, but survival was not longer than in forest soil. The presence of small Douglas-fir (Pseudotsuga menziesii) seedlings did not prolong survival time. Chlamydorores are regarded as the principal survival structures. Mycelial growth was inhibited throughout the year in both forest and cultivated soil. The fungus, a poor competitive soil saprophyte, failed to colonize Douglas-fir twigs when the surrounding soil mixture contained less than 50 percent alfalfa mealsand inoculum. Contrarily, in sterilized forest soil growth was rapid at moisture levels of 43 and 58 percent and at temperatures between 15 and 25°C. Zoospores germinated with subsequent sporangial formation on fir root tips at 15 and 30°C. In unsterilized soil filtrate, zoospores swam to Douglas-fir roots, 3 inches away, but in wet soil, less than 1 inch was transversed. Prolonged low soil moisture was fatal to the fungus.
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Document Type: Journal Article

Affiliations: Formerly Assistant in Plant Pathology, Oregon State Univ., is now Plant Pathologist, Southeastern Forest Expt. Station. Tech.

Publication date: 1964-06-01

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  • 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.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
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