Corn

Tar spot is a new foliar fungal disease of corn first discovered in the United States in 2015 and confirmed in Maryland in 2022 and was estimated to be the most significant yield-limiting disease of corn in the US in 2021 and 2022. As a new disease for our state, this project collected preliminary data on the distribution of tar spot in our state and compared the efficacy of different fungicide application timings.

Tar spot is a disease of corn caused by the fungus Phyllachora maydis.

Agronomy Newsletter -June 2024, Volume 15, Issue 3. Topics include: State Court of Appeals Overturns Circuit Court’s Right-to-Farm Decision, Thoughts on Tar Spot Management, Scouting for Fusarium Head Blight, Paraquat Training Opportunities, June IPM Insect Scouting Tips, UMD Faculty Member Partners Nationally to Release Highly Anticipated Decision Aid Tool to Produce Maximum Crop Yield, New Forage Enterprise Budgets, Fungicide Efficacy Tables for Corn and Soybean, Weather Outlook, and Maryland Regional Crop Reports.

Agronomy News is a statewide newsletter for farmers, consultants, researchers, and educators interested in grain and row crop forage production systems. The topics for this edition are

As you’re scouting fields this summer, keep this fungal disease in the back of your mind. Tar spot is a fungal disease of corn caused by Phyllachora maydis. It was first discovered in the United States in 2015. In Latin America where tar spot is more common, another fungal species, Monographella maydis, is known to occur in complex with P. maydis; however, only P. maydis has been found in the United States.

With corn harvest underway across the state, growers may be encountering ear rots and stalk rots in affected fields. The degree of severity is dependent on a variety of factors, so it is wise to scout fields prior to harvesting in order to identify problematic fields and give those harvest priority.

Agronomy News-October 2022, Volume 13, Issue 7. Topics in this issue are Survey of the Most Common and Troublesome Weeds, Farm Emergency Action Plan, Preparing for 2023: Small Grains Disease Management, Maryland Accepting Proposals for 2023 Animal Waste Technology Fund, Scouting For Ear and Stalk Rots in Corn, Keep An Eye On Nitrogen Fertilizer Prices, Grain Market Report, Weather Outlook, and Regional Crop Reports.

Tar Spot Update: First Reports

Ear and Stalk Rots May be an Issue in Corn

Agronomy News, September 2024, Volume 15, Issue 6. Inside this issue: New Mitigation Menus to Reduce Pesticide Runoff, 2024 Farmland Cash Rental Rates, Ear and Stalk Rots in Corn, Sustainable IPM Workshop, Agriculture Technology Conference, First Reports of Tar Spot for 2024, 2024 Cover Crop Program Planting Information, Heirs’ Property Workshop, SARE Farmer Grants , Weather Outlook, and Regional Crop Reports.