In this week’s CropCast, Seth Naeve and David Nicolai welcomed Dr. Dean Malvick, University of Minnesota Extension plant pathologist for corn and soybeans. Dean discussed the selection and Corn Tar Spot management criteria for growers to consider when choosing their 2025 corn seed inputs and crop inputs. While crop yield data from multiple sites in 2024 is extremely important, yield stability over time as affected by disease resistance for corn tar spot is essential in the selection process.

Dr. Malvick provided a review of the corn tar spot disease biology and the 2024 spread of the disease in corn production fields this year across Minnesota and into adjoining states. Dean specifically provided what is known and what is not known about progression and incidence of the disease occurrence in relation to weather, environment, wind spread and crop rotation effects. Because of the many disease risk factors that can occur each year there is not a simple answer to managing this disease. Dean discussed these factors and possible management controls such as hybrid corn selection, along with the use and timing of foliar fungicides. He also reviewed the best management practice for timely scouting for the presence of the disease in the summer of the growing season to provide more information when determining the use of corn foliar fungicides.

To see a distribution map where tar spot has been confirmed and real-time disease activity during the growing season in the US, visit https://corn.ipmpipe.org/tarspot/.

To learn more about the identification, biology, weather and research trials relating to the management of corn tar spot please refer to a previous episode of a University of Minnesota Strategic Farming webcast report from 2023.

Curt Burns, a farmer and independent crop consultant from South Central Minnesota joins Dave and Seth for a chat about the 2024 crop and soybean harvest. Curt farms in the Steward area and supports other farming operations as an independent crop consultant with C.B. Agronomics in Sibley, Renville, McLeod, Meeker, Nicollet, Kandihohyi Counties.

Dave and Seth chat with Curt about the soybean harvest progress and yields. The exceptionally dry and warm fall conditions have left Minnesota soybeans in an unusually dry condition that has led to yield losses for the farmer who is selling overly dry soybeans plus significant field losses due to shattering and harvest loss. Curt discusses his opinions related to yield losses due to the excess spring and summer rainfall and late drought conditions and reports on the soybean yields farmers are seeing in his region. Curt chats with Seth and Dave about variety selection for both corn and soybean. Curt is concerned about other fall activities during this very dry fall. Soil tests may be particularly accurate and will be difficult to pull, and warm and dry soils will lead to N losses for aggressive farmers.

Join Dave and Seth for another great Minnesota CropCast with Curt Burns.

This week’s University of Minnesota Extension "Minnesota CropCast” host Dave Nicolai has as his guest Dr. Tom Peters, Extension Sugarbeet weed specialist for the University of Minnesota and North Dakota State University. Tom provided an update on sugarbeet harvest progress and challenges this growing season for both the Red River Valley and southern Minnesota sugarbeet growing areas. In addition, Tom reviewed the major weed problems, herbicide options and what the future may hold in terms of new herbicide technologies. Finally, Tom provided an in-depth update about his 2024 weed control research programs and recommendations to consider when planning for 2025 weed control in rotated crops in sugarbeet programs.