Description: English: Photographer: Howard F. Schwartz Organization: Colorado State University Descriptor: Symptoms Description: A sunflower plant with Phoma black stem infection caused by Phoma macdonaldii. Image type:Field Host: sunflower (Helianthus spp. L.). Date: 25 January 2008. Source:
http://www.forestryimages.org/browse/subthumb.cfm?sub=18967. Author: Howard F. Schwartz. Location: United States Licensing[
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