Summary[edit] Description: English: Symptoms of Clavibacter michiganensis infection on tomato, causing a disease known as bacterial canker. Date: 29 October 2008. Source: http://www.forestryimages.org/browse/detail.cfm?imgnum=5333076. Author: Mary Ann Hansen. Please cite: Mary Ann Hansen, Virginia Polytechnic Institute and State University, Bugwood.org Licensing[edit] : This file is licensed under the Creative CommonsAttribution-Share Alike 3.0 Unported license. :. https://creativecommons.org/licenses/by-sa/3.0 CC BY-SA 3.0 Creative Commons Attribution-Share Alike 3.0 truetrue.