Causing annual yield losses between 5 and 25%, corn stalk lodging not only reduces the amount of harvestable corn but can also increase harvest time and drying cost and decrease grain quality.¹
Understanding the seven factors that increase lodging risk can help you minimize their impact.
1. Hybrid selection
Corn hybrid stalk strength depends on two primary factors: yield potential and disease susceptibility.
Higher yielding genetics typically transfer a high percentage of carbohydrates from the stalks to the ears during grain fill, reducing stalk diameter, making it prone to breakage.
Hybrids susceptible to stalk rot are also more likely to lodge when exposed to other stressors. Look for hybrids with low susceptibility to stalk rot and lodging.
2. High plant density
High seeding rates cause stalks to grow taller and thinner to reach sunlight. Competition for light, nutrients and moisture creates competition for carbohydrates between the stalk and ear, decreasing vigor and making stalks more susceptible to rot.
Choose corn seeding rates that promote high yield without causing unnecessary resource competition.
3. Corn stalk rot diseases and fungal pathogens
Corn stalk rot weakens stalk integrity and increases lodging risk. Fungal diseases like tar spot and gray leaf spot also weaken stands by shifting carbohydrates to complete grain fill.
Applying Veltyma™ fungicide near the VT (tassel) stage can indirectly reduce the risk of stalk lodging by protecting corn from foliar diseases and stress.
4. Insect damage
Insect damage from pests like corn rootworm and European corn borer can increase lodging risk. Planting Bt corn can help reduce these insect populations as well as corn earworm, common stalk borer, armyworm, and southwestern corn borer.
5. High winds
Wind damage in corn includes leaning or flattened stalks. If stalks are flattened but unbroken and roots are still intact, they can often right themselves, but the damage sustained can still impede photosynthesis, growth, pollination and grain fill.
High winds plus saturated soil increases root lodging risk (when roots are pulled from the soil entirely). Root lodging makes recovery unlikely especially once stalk elongation is complete and corn is nearly full height.
6. Soil fertility and nutrient levels
These soil nutrient levels increase the likelihood of corn lodging:
- Both high and low nitrogen
- High nitrogen with low potassium
- Low phosphorus
Test your soil to gauge nutrient levels and necessary inputs.
7. Soil conditions
Cold, waterlogged, dry and compacted soil can all hinder root development early in the season and increase risk of corn stalk lodging. Plants with weak root systems are prime candidates for lodging. Manage moisture to reduce the risk.
How to evaluate corn stalk lodging risk in your field
A push or pinch test can help you evaluate your risks of stalk lodging in corn prior to harvest.
Choose 20 plants in at least five random areas in a field.
- Pinch test: Grab the corn stalk between the lowest two internodes and pinch it to see if the stalk can handle the pressure. If it withstands the force, it passes. You can likely proceed with your normal harvest timeline. But if the stalk collapses, it fails.
- Push test: Push the stalk to a 30-degree angle to test its resiliency. If it pops back up when you release, it passes the test. If not, it fails.
If the results indicate that 10% or more of the stalks (two out of 20 stalks) have failed the test, early harvest may be recommended to avoid risk for stalk lodging.²
Experts are available to help you make your decisions. 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
- Nielsen, Bob. “Stalk Lodging in Corn: Guidelines for Preventive Management.” Purdue Extension, www.extension.purdue.edu/extmedia/ay/ay-262.html. Accessed 25 June 2026.
- Wise, Kiersten. “Avoiding Lodged Corn.” Department of Plant and Soil Sciences, University of Kentucky, 10 Sept. 2025, graincrops.mgcafe.uky.edu/articles/avoiding-lodged-corn. Accessed 25 June 2026.
