corn  foliar disease diagrams

Editor’s note: The following was written by Nathan Kleczewski, University of Illinois Extension weed specialist, for the university’s crop management Bulletin.

Many in the agricultural community, annually rate corn for disease as a means to assess hybrid response, hybrid effectiveness or potential disease level on field productivity. It can be difficult to train the eye to accurately measure disease on foliage, and the type and size of the structure or lesion associated with the pathogen varies significantly. These disease area diagrams were developed to help you obtain accurate disease severity estimates in your fields.

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