Geosmithia morbida
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Fungal disease of walnut species, especially Black Walnut, caused by the fungus Geosmithia morbida and spread by the Walnut Twig Beetle, Pityophthorus junglandis.
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Black walnut with large trunk canker. Whitney Cranshaw, Colorado State University, Bugwood.org
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Walnut Twig Beetle. Steven Valley, Oregon Department of Agriculture, Bugwood.org
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