Several different fungi cause stalk rot in corn across the U.S. Corn Belt, and gibberella stalk rot is among the most common forms. Stalk rot depresses yields some 5% each year, and it’s not unheard of for yields to fall 10% to 20% or more.1 In rare cases, total yield loss is possible.
Corn growers can mitigate the risk of these devastating outcomes by learning to proactively manage the conditions that enable gibberella stalk rot corn infections and to spot the symptoms in cases where the fungus has begun to spread.
Gibberella stalk rot life cycle and infection identification
The life cycle of Gibberella zeae, the fungus that causes gibberella stalk rot, spans three phases: overwintering, spore production and dispersal, and infection and disease development. Here’s a breakdown of key moments during each stage, followed by a discussion of management strategies corresponding to each.
Life Cycle Stage 1: Overwintering
During winter, gibberella starts its life cycle. It makes its home in corn residue left over from the earlier season’s harvest. Sometimes, it’s also present in corn seed.2
Life Cycle Stage 2: Spore production and dispersal
As time progresses, wet weather arrives, creating prime conditions for the fungus to produce spores. The spores can be spread through splashing water or through wind.
Life Cycle Stage 3: Infection and disease development
Gibberella stalk rot corn infections often occur soon after pollination (R1). It can enter new corn plants via roots, cuts or gashes in stalks, or even via scars on corn leaves. Corn plants are especially vulnerable if weather conditions are warm and wet between two and three weeks after silking.
Corn growers can spot an infected plant by examining the first internode on the stalk and looking for blue-black dots known as perithecia, which can be scratched away using a fingernail.3 Gibberella stalk rot also causes the stalk’s pith to turn pinkish-red and to crumble and fall apart.
Management strategies for gibberella stalk rot in corn
Corn growers can prevent the worst effects of gibberella stalk rot by implementing management strategies corresponding to each stage of the disease’s life cycle. Here are the essential steps for each stage.
Overwintering: Manage with crop rotation, hybrid selection
Several strategies can help growers fight back against gibberella stalk rot during its overwintering stage post-harvest.
First, aim to plant a variety of crops in rotation rather than consistently planting corn after corn. This can help curb many common stalk rots, including gibberella stalk rot.
Second, growers should be aware that gibberella stalk rot can infect other crops, such as wheat. Determine which crops have genetic resistance to gibberella stalk rot to avoid contamination of other crops in the rotation.
More broadly, try to plant crops that have broad resistance both to disease and other pests to ensure a healthy corn stand from planting to harvest. Plants that have built-in protection from foliar disease and insects can produce healthy stalks and mitigate the risk of infection from a variety of sources.
Spore production and dispersal: Manage with reduced plant stress, foliar fungicides
As warmer and wetter weather becomes more common, find ways to keep the corn crop healthy. Corn growers can reduce plant stress by investing in good soil drainage and also by ensuring plants have the right levels of nutrients in the soil.
Another helpful management practice can be to apply a foliar fungicide during the VT to R1 growth stages — in other words, between tasseling and silking. That’s primarily true if growers notice signs of fungi and other diseases in the form of leaf spots.4 The more widespread leaf diseases are, the more vulnerable corn plants are to gibberella stalk rot.5 The application doesn’t eradicate the fungus but rather gives the plant an extra boost in fending off foliar disease that makes it more susceptible to gibberella stalk rot corn infection.
On the other hand, if growers don’t see a lot of foliar pressure, a fungicide application might not be very helpful in mitigating gibberella stalk rot.
Infection and disease development: Manage with tillage
After harvest, some corn growers might consider using tillage to put infected corn residue underground.6 This could mitigate the possibility that fungi stick around during the winter and reemerge in the next season’s crop. Consult your corn seed supplier for appropriate hybrid and seed treatment packages that are offered with their seed.
Experts are available to help you make your decisions to reduce the risk of gibberella stalk rot. Reach out to your seed retailer, a nearby extension office agent, or a seed company professional like your regional BASF representative.
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Endnotes
- University of Nebraska-Lincoln Extension. Gibberella Stalk Rot of Corn (EC1898). 2014, extensionpubs.unl.edu/publication/ec1898/2014/pdf/view/ec1898-2014.pdf. Accessed 24 Mar. 2025.
- Crop Protection Network. “Gibberella Crown Rot and Stalk Rot of Corn.” Crop Protection Network, cropprotectionnetwork.org/encyclopedia/gibberella-crown-rot-and-stalk-rot-of-corn. Accessed 24 Mar. 2025.
- Purdue University Extension. Stalk Rots of Corn (BP-89-W). Purdue University, www.extension.purdue.edu/extmedia/BP/BP-89-W.pdf. Accessed 24 Mar. 2025.
- Purdue University Department of Agronomy. “2023 Corn Stalk Rot and Ear Rot.” Purdue University Agronomy News, 19 Sept. 2023, ag.purdue.edu/news/department/agry/kernel-news/2023/09/2023-corn-stalkrot-earrot.html. Accessed 24 Mar. 2025.
- Iowa State University Extension and Outreach. “Applying Fungicides to Corn: Stop, Look, Consider.” Iowa State University Extension and Outreach, crops.extension.iastate.edu/encyclopedia/applying-fungicides-corn-stop-look-consider. Accessed 24 Mar. 2025.
- American Phytopathological Society. “Fusarium.” APS Education Center, www.apsnet.org/edcenter/pdlessons/Pages/Fusarium.aspx. Accessed 24 Mar. 2025.
