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Agronomic Crops Network

Ohio State University Extension

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Corn Disease

C.O.R.N. Newsletter Articles

  1. ear of corn with pink and white fungal growth on tip

    OSU Corn Deoxynivalenol, DON, (Vomitoxin) Resistance Screening Program-2024

    Author(s): Jason Hartschuh, CCA , Author(s): Rich Minyo , Author(s): Pierce Paul , Author(s): Stephanie Karhoff, CCA

    With support from Ohio Corn and Wheat through the Corn Check Off, OSU conducted its second year of corn deoxynivalenol (DON) hybrid susceptibility screening. The objective of this project was to identify hybrids with partial genetic resistance to DON. Use these results with caution as we were not able to evaluate the effects of all possible weather environments on DON production. This trial was conducted at three locations across the state that represent different production regions: Apple Creek, Bucyrus, and South Charleston.

    Issue: 2025-04

  2. Tar Spot Diagnosis, Tracking, and Reporting

    Author(s): Pierce Paul , Author(s): Francesca Rotondo

    Tar spot is beginning to show up in a few corn fields across the state, but based on some of the samples received and questions asked, there is still some uncertainty about the correct diagnosis or identification of this disease, particularly during the early stages of its development. When fully developed, the stromata are easy to see and feel on the surface of leaves (or ear husks later in the season) as slightly raised black spots resembling sprinklings of tar that give the disease its name.

    Issue: 2023-26
  3. Figure 1. Gray leaf spot

    Continue to Scout for Corn Foliar Diseases

    Author(s): Stephanie Karhoff, CCA , Author(s): Jason Hartschuh, CCA , Author(s): Pierce Paul

    A dry early June delayed disease progression in corn, but we have received reports of gray leaf spot (GLS), tar spot, and to a lesser extent, northern corn leaf blight (NCLB) after recent wet, humid conditions. Corn growth and development is variable across Ohio, ranging from VT to R3 (“milk” stage). Continued scouting is needed, especially in fields with susceptible hybrids and a history of foliar diseases. Scouting efforts should also focus on continuous-corn, no-till fields, since fungal pathogens causing disease can overwinter on crop residue.

    Issue: 2023-26

  4. Battle for the Belt: Episode 21

    Author(s): Taylor Dill , Author(s): Laura Lindsey , Author(s): Osler Ortez , Author(s): Stephanie Karhoff, CCA , Author(s): Luke Waltz

    Episode 21 of Battle for the Belt is now available: https://www.youtube.com/watch?v=dPd3diZNFsU     

    Issue: 2023-25
  5. Gibberella ear rot in corn

    Harvesting and Handling Ear Rot-Affected Corn

    Author(s): Jason Hartschuh, CCA , Author(s): Pierce Paul

    Ear rots and mycotoxins: Ear rots are beginning to show up in pockets across the state, leading to concerns about mycotoxin contamination of grain. So far, we have received images and samples with Gibberella, Diplodia, Fusarium, and Trichoderma ear rots, four of the most common ear rots in the state. Of these, Gibberella (GER) and Fusarium ear rots are of greatest concerns, since grain harvested from affected fields will be contaminated with mycotoxins, particularly vomitoxin in the case of GER.

    Issue: 2022-34
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Publications

  1. Abnormal Ear Diagnosis Poster, ACE-1

    Abnormal Ear Diagnosis Poster,  ACE-1. Farmers frequently encounter abnormal corn ears in their fields when the crop has experienced a major stress, such as drought, temperature extremes, disease, insect injury, or misapplied chemicals. These abnormalities often affect yield and grain quality adversely. In this poster, ten abnormal corn ears with distinct symptoms and causes are highlighted. The purpose of the poster is to help corn growers and agricultural professionals diagnose various ear disorders.

  2. Corn Disease Management in Ohio, Bulletin 804

    Corn Disease Management in Ohio, Bulletin 804. Five to 15 percent of Ohio's corn crop is lost to disease each year, amounting to nearly $100 million in lost farm income. Corn diseases include seedling diseases, leaf blights, stalk rots, ear and kernel rots, and viruses. This bulletin describes the disease symptoms, provides color images, gives the environmental factors favoring the disease, the method of transmission and infection, and management options for the major diseases affecting corn in Ohio.

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