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    Author(s): E.E. Nelson; W.G. Thies; C.Y. Li
    Date: 1986
    Source: Res. Note PNW-RN-436. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 7 p
    Publication Series: Research Note (RN)
    Station: Pacific Northwest Research Station
    PDF: View PDF  (440 KB)

    Description

    Cones systematically collected in 1983 from eight Douglas-fir seed orchards in western Washington and Oregon yielded large numbers of common molds. Fungi isolated from apparently healthy, developing cones were similar to those from necrotic cones. Necrosis in cones aborted in early stages of development was apparently not associated with pathogenic fungi or bacteria. Environmental factors appeared to account for early cone abortions, although on-site temperatures were not recorded, nor were those fungi isolated from aborted cones tested for pathogenicity. Necrotic areas in cones collected during the summer were associated with insect activity. Good crops of healthy cones were produced when fertilization and partial girdling had been used to stimulate cone production and insecticides used to control cone insects.

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    Citation

    Nelson, E.E.; Thies, W.G.; Li, C.Y. 1986. Are seed and cone pathogens causing significant losses in Pacific Northwest seed orchards?. Res. Note PNW-RN-436. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 7 p

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    Keywords

    diseases (cone), diseases (seed), orchards (seed), Pacific Northwest, Douglas-fir

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