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Title: Elytroderm disease in young, planted Jeffrey pine, South Lake Tahoe, California
Author: Scharpf, Robert F.; Bega, Robert V.
Source: Res. Note PSW-RN-399. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 2 p
Station ID: RN-PSW-399
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.
Key Words: Elytroderma deformans, Pinus jeffreyi, P. ponderosa, Elytroderma disease, seedlings, damage, forest disease, fungus disease, injury, regeneration
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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.