Early-Season Corn Disease: Northern Corn Leaf Blight
Joshua Putman, Field Crops and Forage Specialist
Southwest New York Dairy, Livestock and Field Crops Program

In 2019, northern corn leaf blight (NCLB) appeared throughout the Southwest New York region. In general, NCLB is more of an issue in fields with a history of continuous corn production however, this year, the environment has been conducive for the infection to occur in first year corn fields as well. Environmental conditions of 65-85F, sporadic rain events, and humidity can result in an NCLB infection. Early NCLB symptoms appear as long, narrow, tan lesions that form on the leaf surface of a corn plant. As the disease progresses, the lesions become longer, more oblong, or "cigar-shaped" and can appear grayish in color. These lesions can range from 1-8 inches long with multiple lesions forming dense, irregular areas of dead tissue on the corn leaves. Cornell University Field Crops Plant Pathologist, Dr. Gary Bergstrom, recommends we scout our fields now for early disease detection. For more information visit Purdue University Extension or contact Field Crops Specialist, Josh Putman.
Upcoming Events
FAMACHA Training for Sheep and Goat producers in Woodhull NY
August 13, 2025 : FAMACHA Training in Woodhull
Woodhull, NY
Join us for a discussion and hands-on training for internal parasite integrated pest management in sheep and goats. Certification is available to all students participating in the workshop.
Cover Crop & Soil Health Field Day
August 13, 2025
Andover, NY
Please join us for a morning of hands-on learning with expert insights from local farmers, industry representatives, and extension. We will have some demonstration plots in action along with discussion about how cover crops influence soils and demonstration showing impacts on farm resiliency.
Pasture Walk in Woodhull, NY
August 20, 2025 : Pasture Walk in Woodhull, NY
Woodhull, NY
Join us on one of our region's sheep farms to walk their pastures and explore managing sheep in a frequent rotational grazing system
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