Corn Hybrid Responses to Gray Leaf Spot Disease in Ohio, spanning 1995-1996
Moderate Resistance to Gray Leaf Spot Offers Benefits for Ohio Corn Farmers
A new study by the Ohio State Agronomic Crops Network (C.O.R.N.) has identified several top-performing corn hybrids with moderate resistance to Gray Leaf Spot (GLS), a common disease in Ohio's climate. These hybrids could offer a valuable solution for farmers looking to manage GLS while maintaining high yields.
According to the C.O.R.N. newsletter, four of the six on-farm locations in 1996 exhibited similar levels of GLS. However, disease development was retarded until late in the season. Remarkably, the hybrid Pioneer 3335, which appears to be tolerant to GLS, had disease levels not significantly less than those recorded for the susceptible hybrid by the end of the season, but its yield was not significantly less than the more resistant hybrids in 1995.
Comparisons of disease progress curves indicate that GLS increases more slowly on more resistant hybrids than on the susceptible hybrid. By the end of the 1995 season, more resistant hybrids had less percentage ear leaf area covered with lesions than Pioneer 3394.
For the 2025 growing season, some of the recommended hybrids with moderate resistance to GLS include Dyna-Gro 9593, Ebberts 978, AGI 244B, and Pond PSC 707. These hybrids, each with a relative maturity (RM) between 25 and 28, offer good yield potential and bushel weight.
While hybrids like Seed Consultants 13S25, listed as resistant (not just moderately resistant) to GLS, may also be considered, it's important to remember that the choice of hybrid should also take into account maturity group, yield potential, and overall disease resistance.
The data for these recommendations comes from the 2025 Ohio State Agronomic Crops Network (C.O.R.N.) newsletter and reflects performance and disease resistance ratings specifically for hybrids tested in Ohio environments.
In contrast, differences in disease increase over time were detected among hybrids in both years. However, when GLS pressure is severe, commercial moderately resistant hybrids have been found to have higher yield potential than the susceptible check. For instance, in 1995, by 25 September at 1/2 milk line stage, more resistant hybrids averaged nearly half the percentage ear leaf area affected as did Pioneer 3394.
However, when GLS development is less severe, certain resistant hybrids may offer no yield advantage over popular susceptible types. In 1996, the difference between more resistant hybrids and the susceptible hybrid was not as dramatic, with six hybrids producing grain yields significantly greater than the susceptible check in 1996.
In conclusion, while comprehensive lists focused only on GLS were not found beyond the mentioned hybrids, the C.O.R.N. newsletter tables are a key resource for updated Ohio corn hybrid performance and resistance ratings. Fungicide applications and agronomic management should complement hybrid choice for best Gray Leaf Spot control.
- Embarking on health-and-wellness practices, one might consider the benefits of horticulture, as the knowledge gained from science could help in the conservation of crops, such as corn, that have moderate resistance to Gray Leaf Spot disease, a common medical-condition affecting plants in Ohio's climate.
- In the realm of science, understanding the differences in resistance levels among various corn hybrids can contribute significantly to the health-and-wellness of crops, as it helps in the selection of hybrids with moderate resistance to Gray Leaf Spot, improving the overall horticulture, and indirectly contributing to the conservation of resources.
