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Northern Corn Leaf Blight in Sweet Corn

Julie Kikkert, Team Leader, Extension Vegetable Specialist
Cornell Vegetable Program

August 8, 2016

Northern Corn Leaf Blight in Sweet Corn
Over the past 5 years, Northern Corn Leaf Blight (NCLB) has become a common occurrence in field and sweet corn in New York State. Researchers at Cornell University are working to determine why this disease has become more prevalent. Current hypotheses include: 1) new races of the fungus, 2) new corn hybrids may be more susceptible, 3) weather patterns that favor disease, and 4) changes in the larger cropping picture. There may be a sort of an "arms race" between new races of the fungus and new corn hybrids. Western NY has seen an increase in field corn being grown and increased disease in field corn creates additional inoculum for sweet corn in the region. If NCLB becomes severe, yields may be reduced. Fresh market sweet corn growers may also be concerned with lesions that appear on the husks, as the corn may be less marketable.

The fungus Exerohilum turcicum that causes NCLB survives as spores or mycelia on corn debris over the winter. The inoculum can be splashed onto the current corn crop or can arrive by wind. The spores can be moved long distances by wind. Early infections come from within the field and are more damaging. As the season progresses and the numbers of spores in the air increases, all fields become susceptible. Infection is favored by leaf wetness and cool weather (64-81 F) as typically occurs later in the growing season.

Lesions of NCLB begin as grayish green and become tan as they mature. The slender oblong shape, with tapered ends, gives them a cigar or boat-shaped appearance. Lesions range from 1 to 6 inches in length and may coalesce to cover the entire leaf. Spores are produced on the underside of the leaves, and appear as dusty green fuzz.

Resistant varieties and cultural practices to reduce inoculum and disease risk are the best practices. Fields should be scouted whorl through tassel. There is a scouting video for field corn developed by the NYS IPM Program (see list of resources below). Several fungicides are labeled and a listing can be found in the Cornell Vegetable Guidelines. 

ADDITIONAL RESOURCES

NYS IPM Scouting video:



Cornell NCLB fact sheet
includes lists of fungicides and their relative effectiveness. Note: check labels for sweet corn.

Vegetable MD Online, Sweet Corn Diseases

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Upcoming Events

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January 2, 2025
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Announcements

Winter Cover Cropping in High Tunnels

Cornell Cooperative Extension is researching cover crops for high tunnel growers to better manage fertility and improve soil health. Our work has shown that winter cover cropping in high tunnels has the potential to add organic matter, improve soil structure, support microbial activity, and help with nutrient management by scavenging leftover nitrogen and/or fixing nitrogen. This publication, Management Practices for High Organic Matter Soils: Winter Cover Cropping in High Tunnels, shares best practices for winter cover cropping in high tunnels including species selection, planting rates and dates, termination, and cultural management considerations.

Laser Scarecrows to Deter Birds in Sweet Corn

Are you considering the use of a laser scarecrow to deter birds on your farm? Cornell Cooperative Extension and the University of Rhode Island teamed up to test a research laser scarecrow on sweet corn farms.

A laser scarecrow is a device that has one or more laser modules connected to motors. The specifications of the lasers are optimized to the color and motion sensitivity of bird's eyes. When laser beams move across a field, birds become frightened and attempt to move away from the perceived threat. Light from the laser covers an area quickly and moves through the canopy without causing injury to the crop. Research demonstrates that birds do not readily become habituated to the laser.

A laser scarecrow used as the sole deterrent typically results in a significant reduction in crop damage. Combined with an auditory device, damage can be reduced even more. When used as part of an integrated management program for bird control that utilizes habitat management and multiple scare tactics, laser scarecrows can be useful tools for growers of multiple crops. All scare tactics must be deployed before birds find the field. The effectiveness of lasers depends on multiple factors such as bird species, bird populations, habitat and food availability. Lasers are not effective at deterring deer, racoons, coyotes or other mammals.

To learn more, the Laser Scarecrows to Deter Birds in Sweet Corn and Other High-Value Agricultural Crops fact sheet provides background information, research data, FAQs, and Advantages/Limitations on laser scarecrows.

NY Urban Farms Pest Management Fact Sheet Series

Cornell Cooperative Extension has partnered with dozens of urban farms across New York State to demonstrate and evaluate sustainable pest management strategies. Together with farmers, we found success using control methods that prevent or reduce crop losses through exclusion strategies, crop timing, host resistance, the introduction of beneficial organisms, and more. Regardless of management strategy used, common requirements for success include a knowledge of the pest and disease complex, preventative deployment and commitment to the process. The New York Urban Farms Sustainable Pest Management Fact Sheet Series includes case studies highlighting pest management techniques that New York urban farms have found valuable.

NYS Urban Growers Pest Management Needs Assessment

As part of a multi-year project exploring non-spray pest management options that are economically and environmentally sustainable for urban farms, we conducted a needs assessment with urban growers across New York State. The New York State Urban Growers Pest Management Needs Assessment presents findings on current pest management practices, challenges, and topics of future interest.

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