title: In memoriam--John M. Young (1942-2013).
mesh_terms: D060054:Agrobacterium / Q000145:classification; D049673:History, 20th Century; D049674:History, 21st Century; D010935:Plant Diseases / Q000382:microbiology*; D011549:Pseudomonas / Q000145:classification; D012231:Rhizobium / Q000145:classification; D009626:Terminology as Topic; D014974:Xanthomonas / Q000145:classification