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Discovery of Walnut Twig Beetle, Pityophthorus juglandis, Associated with Forested Black Walnut, Juglans nigra, in the Eastern U.S.

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Department of Entomology and Plant Pathology, 2505 E.J. Chapman Drive, 370 Plant Biotechnology Building, The University of Tennessee, Knoxville, TN 37996-4560, USA
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USDA Forest Service Forest Health Protection, 200 W.T. Weaver Boulevard, Asheville, NC 28806, USA
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Author to whom correspondence should be addressed.
Forests 2014, 5(6), 1185-1193; https://doi.org/10.3390/f5061185
Received: 18 March 2014 / Revised: 9 May 2014 / Accepted: 21 May 2014 / Published: 28 May 2014
Thousand cankers disease (TCD) is an insect-mediated disease of walnut trees (Juglans spp.) involving walnut twig beetle (Pityophthorus juglandis) and a fungal pathogen (Geosmithia morbida). Although first documented on walnut species in the western U.S., TCD is now found on black walnut (J. nigra) in five states in the eastern U.S. Most collections of P. juglandis or G. morbida are from trees in agriculturally- or residentially-developed landscapes. In 2013, 16 pheromone-baited funnel traps were deployed in or near black walnuts in forested conditions to assess the risk of infestation of forested trees by P. juglandis. Four of the 16 funnel traps collected adult P. juglandis from three forested areas (one in North Carolina and two in Tennessee). These collections, while in forested settings, may still be strongly influenced by human activities. The greatest number of P. juglandis (n = 338) was collected from a forested location in an urbanized area near a known TCD-positive tree. The other two forested locations where P. juglandis (n = 3) was collected were in areas where camping is common, and infested firewood may have introduced P. juglandis unintentionally into the area. Future studies to assess P. juglandis on more isolated forested walnuts are planned. View Full-Text
Keywords: walnut twig beetle; Pityophthorus juglandis; Geosmithia morbida; thousand cankers disease; black walnut; Juglans nigra walnut twig beetle; Pityophthorus juglandis; Geosmithia morbida; thousand cankers disease; black walnut; Juglans nigra
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Wiggins, G.J.; Grant, J.F.; Lambdin, P.L.; Merten, P.; Nix, K.A.; Hadziabdic, D.; Windham, M.T. Discovery of Walnut Twig Beetle, Pityophthorus juglandis, Associated with Forested Black Walnut, Juglans nigra, in the Eastern U.S.. Forests 2014, 5, 1185-1193.

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