New Study Reveals Surprising Insights into Tar Spot Management
Published: 01/08/2024
Michigan State University, January 5, 2024 — A new study led by a team of researchers from Michigan State University and FMC Corporation, has challenged conventional wisdom in the management of tar spot, a significant corn pathogen in the U.S. and Canada.
Contrary to previous assumptions, the study found no evidence supporting a relationship between nitrogen application rates and tar spot severity. The research suggests that nitrogen application does not influence the severity of tar spot.
Key Findings:
No Relationship Between Nitrogen (N) Application and Tar Spot Severity: The study found no evidence supporting a relationship between nitrogen application rates and tar spot severity. The research suggests that nitrogen application does not influence the severity of tar spot.
Plant Population Density Impact: Higher plant population densities were unexpectedly associated with lower tar spot severity. Plots with higher plant densities (40-46 thousand plants per acre) exhibited lower tar spot severity compared to lower plant densities (28-34 thousand plants per acre). However, increasing plant density is not considered a viable disease management strategy, as it did not improve economic returns.
Genetic Resistance Crucial: Hybrid susceptibility had a significant impact on tar spot severity and yield at all trial locations. The study emphasizes the importance of genetic resistance in tar spot management and recommends prioritizing hybrids with resistance.
The study challenges traditional practices and recommends genetic resistance over nitrogen adjustments or planting density changes for effective tar spot management. The findings, applicable to neighboring states, open avenues for future research on additional agronomic practices. For more information read the full report here.
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