Date of this Version
Plant Disease Management Reports 10, FC212 (2016).
The objective of the trial was to compare foliar fungicides applied to three growth stages of corn for grey leaf spot (GLS) and 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) was planted at approximately 34,000 seed/A on 26 May. Eight treatments were arranged in a randomized complete block design with six replications. . . . Treatments applied to corn at V6, V8, and R1 did not cause phytotoxicity (data not presented). GLS severity was significantly less in plots treated with Headline AMP 10 fl oz at R1 compared to other fungicides applied at V6, V8, and the nontreated check. SR severity was significantly less when plots were treated with fungicides at R1 compared to V6, V8, and the nontreated check. Further at R1, SR severity was significantly less when plots were treated with Headline AMP 10 oz compared to Topguard 5 oz and Equation 6 oz. Stay green was significantly greater when plots were treated at R1 with Headline AMP 10 oz and Topguard 5 oz compared to other fungicides and the nontreated check. There were no significant differences between fungicides and the nontreated check for push lodging or yield.