Plant Pathology Department


Date of this Version



Plant Disease Management Reports 10, FC095 (2015).


Copyright © 2015 The American Phytopathological Society. Used by permission.


The objective of the trial was to compare foliar fungicides with other fungicide programs for gray leaf spot (GLS) efficacy. Corn was grown under normal, irrigated agronomic practices at the South Central Ag Lab near Clay Center, NE. Soils were a silt loam with 6.7 pH and 1.8 % organic matter, and the previous crop was corn. Reduced tillage was performed to the field prior to planting. Corn (DKC 64-83 RIB, moderately susceptible to GLS) was planted at approximately 34,000 seed/A on 20 May. Eleven treatments were arranged in a randomized complete block design with six replications. . . . Plots treated with Headline AMP were significantly greener than all other treatments. Correspondingly, AUDPC values were significantly lower in plots treated at R1 versus V5. Custodia and Headline AMP applied at R1 significantly reduced wind lodging compared to V5-applied Custodia 6 fl oz, Fortix, Orius, and Quadris. Push lodging was significantly less when plots were treated with Headline at R1 compared to Custodia treatments and the nontreated check. Yields were nonsignificant between fungicides and the nontreated check. Overall, fungicides applied at R1 reduced GLS severity and increased stay green.