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corn, no-till, and hail damage conditions may increase the risk for common smut infection on leaves," Byamukama said.
• Another disease beginning to develop on corn is common rust (Fig.6). Several fields scouted had trace levels of this rust developing.
• "This disease rarely develops to high levels to cause yield loss because most hybrids have good tolerance to this pathogen. The common rust pathogen does not survive in South Dakota; the spores are blown in from the southern states in spring. . Therefore residue management or crop rotation will not affect common rust or any other rust disease, for that matter", he said
• If growers plan to apply fungicide, Byamukama said a general note on fungicide application on corn is that several research reports show that increase in yield from fungicide application happens when disease severity on flag leaf at R5 is greater than 5 percent. He encourages growers to review a publication published by Iowa State University, at see : http://www.extension.iastate.edu/CropNews/2010/0706muellerandrobertson.htm
• "Most of the corn scouted across the state looked very clean with no disease developing. Corn following corn or corn on no-till may have an elevated risk for significant disease to develop, depending upon the cultivar planted and weather conditions," he said. "Applying a fungicide at tasseling in this case may be beneficial."
• • The corn plant pathology working group published a list of fungicides that are effective for several fungal pathogens on corn. This table can be found here: http://www.uky.edu/Ag/GrainCrops/Briefs/CDWGCornFungicideEfficacy_Table_2013_FINAL.pdf
• Byamukama said fungicide application should be done when all corn has fully tasseled to avoid arrested ear syndrome, a physiological disorder that is caused by nonionic surfactant (NIS) fungicide additives when applied before tasseling. To learn more about this visit, www.extension.purdue.edu/extmedia/BP/BP-85-W.pdf.
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