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    Author(s): Jennifer JuzwikMelanie Moore; Geoffrey Williams; Matthew Ginzel
    Date: 2020
    Source: Gen. Tech. Rep. SRS-250. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station
    Publication Series: Book Chapter
    Station: Southern Research Station
    PDF: Download Publication  (369.0 KB)

    Description

    Thousand cankers disease (TCD) is caused by a fungus (Geosmithia morbida) vectored by the walnut twig beetle (WTB), Pityophthorus juglandis (Coleoptera: Curculionidae: Scolytinae). This pest complex was first described in Colorado where it has caused the widespread death of eastern black walnut (Juglans nigra) along the Front Range and throughout the Western United States (Tisserat and others 2009). In August 2010, TCD was found in Knoxville, TN—the first discovery of the disease within the native range of black walnut (Grant and others 2011). Since that time, six other States in the Midwest and East have detected the beetle or pathogen on black walnut trees: Virginia, Pennsylvania, North Carolina, Maryland, Ohio, and Indiana (Juzwik and others 2015, Seybold and others 2012).

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    Citation

    Juzwik, Jennifer; Moore, Melanie; Williams, Geoffrey; Ginzel, Matthew. 2020. Chapter 8 - Assessment and etiology of thousand cankers disease within the native range of black walnut (Juglans nigra). In: Potter, Kevin M.; Conkling, Barbara L., eds. Forest health monitoring: national status, trends, and analysis 2019. Gen. Tech. Rep. SRS-250. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station: 169-178.

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