1. Black walnut;Williams,1990
2. Pathway Assessment: Geosmithia sp. and Pityophthorus juglandis Blackman Movement from the Western into the Eastern United States;Newton,2009
3. Black walnut mortality in Colorado caused by the walnut twig beetle and thousand cankers diseasehttp://www.plantmanagementnetwork.org/pub/php/research/2009/walnut/
4. The Genus Pityophthorus Eichh. in North America: A Revisional Study of the Pityophthorini, with Descriptions of Two New Genera and Seventy-One New Species;Blackman,1928
5. Susceptibility of Walnut and Hickory Species to Geosmithia morbida