Corn Disease

C.O.R.N. Newsletter Articles

  1. Corn leaf displaying symptoms of Northern corn leaf blight
    Author(s): Stephanie Karhoff , Author(s): Elizabeth Hawkins

    Preventing significant yield losses from disease is likely on the forefront of growers’ minds following the 2021 growing season. A new product available to growers is FMC’s fungicide Xyway™ LFR®. OSU Extension eFields program is partnering with growers to conduct on-farm trials evaluating the effect of an at-plant soil application of flutriafol (Xyway) on corn health and yield. Information from this trial will be used to improve corn disease management recommendations for growers throughout the state.

    Issue: 2022-11
  2. Author(s): Pierce Paul

    Tillage to remove and speed-up the decomposition of crop residue will help to reduce the risk of tar spot as well as other diseases such as gray leaf spot and northern corn leaf blight that overwinter in infected stubble. This will be particularly important to reduce disease development in 2022, given that in many fields, most of the stubble that remain after harvest came from a 2021 crop with high levels of disease.

    Issue: 2021-39
  3. Tar Spot on Corn
    Author(s): Pierce Paul

    Understandably, tar spot has been the focus of our attention this year, as it has been detected in more than 20 counties. It is a disease that is relatively easy to identify based on visual signs and symptoms, but as we approach the end of the season, it may become increasing difficult for untrained eyes to tell tar spot apart from late stages of some other disease. Yes, tar spot, as the name suggests, is characterized by the presence of raised, black, tar-like spots called stromata predominantly on leaf blades (A).

    Issue: 2021-31
  4. Corn Stalks
    Author(s): Pierce Paul , Author(s): Peter Thomison

    Causes of Stalk Rot: Several factors may contribute to stalk rot, including extreme weather conditions, inadequate fertilization, problems with nutrient uptake, insects, and diseases. This year, the combined effects of prevalent diseases such as northern corn leaf blight, southern rust, tar spot, and gray leaf spot may negatively affect stalk quality. However, the extent of the problem will depend on when these diseases develop and how badly the upper leaves of the plant are damaged.

    Issue: 2021-31
  5. Growing Corn
    Author(s): Jason Hartschuh, CCA , Author(s): Amanda Douridas , Author(s): Mary Griffith , Author(s): Elizabeth Hawkins

    Ohio State University Extension and the Ohio AgriBusiness Association will again partner to hold the Farm Science Review Agronomy College on Sept. 14. The event is designed to educate agronomists, Certified Crop Advisers, custom applicators and farmers on current agronomy issues.

    Highlighted speakers include:

    Issue: 2021-30


  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. 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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