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    Author(s): Robert F. Scharpf; Robert V. Bega
    Date: 1988
    Source: Res. Note PSW-RN-399. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 2 p
    Publication Series: Research Note (RN)
    Station: Pacific Southwest Research Station
    PDF: Download Publication  (245 KB)

    Description

    Little is known about Elytrodema disease (Elytroderma deformans [Weir] Darker) in seedlings or very young trees. Of 100, 2-0 Jeffrey pine (Pinus jeffreyi Grev. & Balf.) seedlings planted in the Taylor Creek area of South Lake Tahoe, about half survived from 1973 to 1987. During this period about two thirds of the surviving seedlings became infected with Elytrodema disease. Of the trees that died, only three were infected with the disease, and none was infected before 1981-82. Earliest infection of surviving seedlings was in 1976, with 1980-81 the only interval without infection. More than half of the infected trees were infected in the terminal shoot, indicating future impact on survival and height growth. No significant growth effects were measured between infected and noninfected trees in this study, however. On sites with high disease hazard at Lake Tahoe, avoid planting Jeffrey pines. Regenerate with resistant conifer species.

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    Citation

    Scharpf, Robert F.; Bega, Robert V. 1988. Elytroderm disease in young, planted Jeffrey pine, South Lake Tahoe, California. Res. Note PSW-RN-399. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 2 p.

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    Keywords

    Elytroderma deformans, Pinus jeffreyi, P. ponderosa, Elytroderma disease, seedlings, damage, forest disease, fungus disease, injury, regeneration

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