Tar Spot Update

Tar spot is a fungal leaf disease that infects corn leaves and causes lodging and yield losses.

Tar spot is a fungal leaf disease that infects corn leaves and causes lodging and yield losses. It has made an abrupt entrance to Midwest and Florida cornfields in the past couple of years.

Due to its recent and rapid development in the United States, there are several unknowns about the disease and its management. Based on climate modeling by Mottaleb et al., (2018), areas at risk of tar spot infection beyond the current range of infestation central Iowa and northwest Ohio. Results indicate the potential for further expansion to the north and south but primarily to the east and west, including New York, Pennsylvania, Ohio, Missouri, Nebraska, South Dakota, eastern Kansas, and southern Minnesota. Yield losses of >30 bushels per acre have been experienced in some areas.

Read more about what is known to date about tar spot on the AgVenture blog.