Plant Pathology Department


Date of this Version



Plant Disease Management Reports 10, FC101 (2016).


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


The objective of the trial was to compare foliar fungicides applied at different corn growth stages for gray 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 % organic matter, and the previous crop was soybean. Reduced tillage was performed to the field prior to planting. Corn (DKC 65-79 RIB, tolerant to GLS) was planted at approximately 34,000 seed/A on 26 May, which is later than normal, due to wet spring conditions. Eight treatments were arranged in a randomized complete block design with six replications. . . . All fungicides significantly increased stay green compared to the nontreated check. Corn was greener when applied with Headline AMP at milk versus the other fungicides. Headline AMP and Stratego YLD applied at milk, plus the nontreated check, had significantly greater grain test weights than the other fungicides. Yields were nonsignificant.