Soybean Farmers Need to Know About Red Crown Rot

Farmers in parts of the Midwest are struggling with unusual challenges in their soybean and corn fields.

Yellowing soybeans have been reported in various fields, potentially linked to issues like root rot, nematodes, or fungal infections like Septoria brown spot. Additionally, a new concern has emerged: red crown rot. Previously unseen in the region, this soil-borne fungus has crept from the southern U.S. into areas of Illinois, southern Indiana, and Missouri.

University of Kentucky plant pathologist Carl Bradley highlighted the disease's spread, noting its impact on soybean crops. Red crown rot, identifiable by the presence of tiny spherical structures on soy plants, causes leaf discoloration, necrosis, and reddish stem discoloration. Bradley emphasized the importance of accurate identification through lab testing.

Though red crown rot can reduce yields and plant health, current cases are mostly confined to small sections within fields. Seed treatments offer some defense against the disease, with the fungicide Saltro approved for use in Illinois and neighboring states. Bradley cautioned that later-planted and double-crop soybean fields appear to be at higher risk.

Also, corn rootworms are emerging across the state. Nick Seiter, an entomologist at the University of Illinois Extension, urged vigilance. While rootworms are typically manageable through crop rotation, continuous corn fields, particularly in northern Illinois, are facing notable infestations. These pests show resistance to below-ground traits, necessitating insecticide use in corn-on-corn situations.

As the agricultural landscape continues to evolve, farmers are urged to remain adaptable and informed to protect their crops and ensure sustainable yields.

Photo Credit: istock-sandramatic