Corn diseases of 2014: Northern corn leaf blight, Physoderma brown spot, ear and stalk rots
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The Iowa State University Integrated Crop Management Conference is Iowa's premier crop production education event. No other program in Iowa brings together the diverse range of topics, slate of expert presenters and results of the latest University research.
The ICM Conference offers workshops focusing on the latest in crop production technology. Experts from Iowa and surrounding states will provide research updates and results in soil fertility, soil and water management, crop production and pest management.
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Abstract
The 2014 growing season started with good conditions at planting. Above normal precipitation in June however was prevalent across most of the state and likely played a role in infection and development of Northern corn leaf blight (NCLB), Physoderma brown spot and stalk rot, and stalk rot. A dry July brought NCLB to a stand still but frequent precipitation events in August and September enabled further development of the disease. Goss’s wilt was also prevalent on hybrids rated susceptible to moderately susceptible to this disease. Although southern rust was reported, the cooler than normal temperatures in August and September prevented the disease from developing and impacting yields. It was common to notice prematurely dead plants in cornfields at towards the end of grain fill. Diplodia and Gibberella ear rot were also present in some fields.