Photo 3123320, (c) Owen Clarkin, some rights reserved (CC BY-NC), uploaded by Owen Clarkin

Attribution © Owen Clarkin some rights reserved Uploaded by owenclarkin Source iNaturalist Associated observations Photos / Sounds What Dutch Elm Disease (Ophiostoma ulmi) Observer owenclarkin Date June 27, 2014 10:31 AM EDT Place Ottawa (Google, OSM) Date Added March 8, 2016 11:10 PM EST Description killing mature Ulmus americana; another Ulmus americana visible to right is already dead 2 IDs Research Grade View Sizes small medium large original