Tar spot continues rapid westward expansion
Tar spot continues its westward march in Iowa corn fields, according to Iowa State University (ISU) Extension plant pathologist Alison Robertson. The disease is now confirmed in 43 counties in Iowa, and has been located as far west as Shelby and Crawford counties.
Tar spot is “easy to find in some fields, more of a challenge in others. Still haven’t seen fields with severe infections,” Robertson...
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