Tar spot

 

tarspot2Tar spot, caused by the fungus Phyllachora maydis, is a newly introduced foliar pathogen of corn identified in Michigan in 2016.

Signs of tar spot include small, raised, black fruiting bodies on both surfaces of the corn leaf. Sometimes these fruiting bodies are surrounded by a necrotic halo, forming a “fisheye” lesion. Yield losses in the US due to tar spot were first documented during the 2018 tar spot epidemic.

Our lab is interested in the management of this disease, including the role of agronomic practices on tar spot, specifically how planting population and nitrogen fertility affects the severity of tar spot infections.To better understand the nature of the pathogen, we are looking at molecular mechanisms of infection to understand how to combat the pathogen as well as defense mechanisms in corn to help breed for disease resistance.

We are also coordinating with other researchers across the Midwest to perform hybrid screenings and foliar fungicide trials to identify best application timing and products to manage tar spot.

 

Research

Michigan State University
  • Spartans Will.
  • © Michigan State University

MSU is an affirmative-action, equal-opportunity employer, committed to achieving excellence through a diverse workforce and inclusive culture that encourages all people to reach their full potential.

Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Quentin Tyler, Director, MSU Extension, East Lansing, MI 48824. This information is for educational purposes only. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned.

The 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707.

We comply with the Federal Trade Commission 1998 Children’s Online Privacy Protection Act (COPPA).