Plant Pathology Department


Date of this Version



Plant Disease Management Reports 10, FC210 (2016).


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


The objective of the trial was to evaluate foliar fungicides and application timings for crop response and foliar disease 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 grey leaf spot (GLS)) was planted at approximately 34,000 seed/A on 26 May. Seven treatments were arranged in a randomized complete block design with six replications. . . . Phytotoxicity was not observed from any fungicide treatment. GLS and SR severity was significantly less when plots were treated at R1, except for Aproach Prima, compared to the V8 fungicide application and the non-treated check. Plots treated with Trivapro A + B at R1 had significantly less SR severity than all other treatments. Plots treated with Priaxor had significantly greater percent stay green than plots treated at V8, Aproach Prima, and the nontreated check. All other R1-applied fungicides provided significantly greater stay green versus the nontreated check. Push lodging was not significantly different between treatments and the nontreated check. Yield differences were nonsignificant between treated plots and the nontreated check.