Field experiments were conducted on producer's fields in Southwest, North-Central, and East Arkansas to evaluate the effect of a single preventative foliar fungicide application to two high yielding glyphosate resistant hybrids with varying foliar disease resistance (Dekalb 69-71 and Pioneer 31G96).� Crop rotations of corn after corn and corn after soybeans were evaluated at each location.�� Preventative foliar fungicide treatments of Quilt at 14 fl oz/acre were applied near silking and brown silk using a modified Co2 backpack sprayer.� Foliar diseases did not develop in any of these experiments and Quilt applications had no impact on corn yield.� Three application timing experiments were conducted on the Pioneer 31G96 (RR + Herculex) hybrid.� Experiments were located in Southwest Arkansas near Foreman and at the Cotton Branch Research Station near Marianna in Eastern Arkansas.� At Marianna, a typical planting date (April 12) and a late planting date (May 26) were evaluated.� Quilt was applied at 14 fl oz/acre to corn from 40 inches tall to near black layer (depending on location)� Foliar diseases were not present in experiments at Foreman or the early planted experiment at Marianna.� However, in the late planted (May 26) corn experiment, Southern rust was found late in the season at high levels.� Quilt applications made prior to silking provided little or no control of southern rust.� Quilt treatments applied after silking and particularly near brown silk provided the highest level of control.� Corn yields however were not increased with any of the Quilt applications due to the late occurrence of the disease in the growing season.� Visually the later Quilt applications maintained plant greenness, which may reduce plant lodging.�� Plant lodging was high for all treatments due to a thunderstorm which resulted in approximately 30% plant lodging across the experiment.�