Effects of At-Plant and Foliar Fungicides on Corn Foliar Disease Severity and Yield in Central Pennsylvania, 2024

Tar spot, caused by Phyllachora maydis, and gray leaf spot, caused by Cercospora zeae- maydis, are foliar diseases that result in yield loss for corn ( Zea mays) in Pennsylvania each year. Tar spot is characterized by black stromata on corn leaves late in the season, while gray leaf spot presents as tan or gray rectangular lesions. These diseases can lead to the death of leaves or the entire plant when symptoms are severe. This trial evaluates the effectiveness of Xyway LFR 2 × 2 treatments in combination with several foliar fungicides applied at the VT growth stage. The trial was conducted at the Russell E. Larson Agricultural Research Center in Pennsylvania Furnace, PA. Results from the trial provide corn growers with information on the best timing and strategies to prevent foliar disease in corn.