Plant Pathology Department


Date of this Version



Plant Disease Management Reports 10, FC213 (2016).


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


The objective of the trial was to compare foliar fungicides applied to three growth stages of corn for grey leaf spot (GLS) 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. . . . Treatments applied to corn at V6, V8, or R1 did not cause phytotoxicity (data not presented). GLS severity was not significantly different in plots treated with fungicides at any corn stage compared to the nontreated check. Lodging was significantly reduced in plots treated with Headline AMP 10 oz at R1 than V6 or V8 Headline AMP treatments and the nontreated check. Plots treated with Fortix applied at V6, V8 or R1 corn were not significantly different than the nontreated check. It is unknown why Glyphos X-tra had such low lodging. There were no significant differences between treatments for yield.