Plant Pathology Department


Date of this Version



Plant Disease Management Reports 10, FC214 (2016).


Copyright © 2016 The American Phytopathological Society. Used by permission.


The objective of the trial was to compare foliar fungicides for southern rust (SR) efficacy. Irrigated corn was grown based on Nebraska Extension irrigation recommendations at the South Central Ag Lab near Clay Center, NE. Soils were a silt loam with 6.7 pH and 1.8 % OM and the previous crop was soybean. Reduced tillage was performed to the field prior to planting. Corn (DKC 65-79 RIB, tolerant to gray leaf spot (GLS)) was planted at approximately 34,000 seed/A on 26 May. Five treatments were arranged in a randomized complete block design with six replications. . . . Phytotoxicity was not observed from any fungicide treatment 7 DAT (data not presented). GLS severity on this particular hybrid was negligible. SR severity was significantly less in plots treated with Quilt Xcel at R1 compared to fungicides applied at V3 and the nontreated check. Percent stay green on ear leaf -2 leaf was significantly greater with Quilt Xcel compared other fungicides and the nontreated check. Stay green on the ear leaf-1, ear leaf, and ear leaf+1 leaves was significantly greater with R3 fungicide treatments compared to V3 fungicide treatments and the nontreated check. Yield differences were nonsignificant between fungicide treatments and the nontreated check.