Answers are grounded in this paper and cite their sources.
A leaf spot of unknown etiology damages winter wheat in the northwestern United States. The symptoms are similar to Septoria leaf blotch and tan spot, but the causal agents of these diseases are not present. Leaf spot symptoms are described. Dominant microbial colonists of the spots were Cladosporium herbarum, C. macrocarpum, C. cladosporioides, and Alternaria species. Leaf spot symptoms could not be induced on fresh leaf tissues with any of the inoculation or incubation procedures examined (.)
No takes yet. Share an insight, caveat, or question.
Richard W. Smiley (1993) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: