Plant Pathology Department


Date of this Version



Plant Disease Management Reports 10, FC211 (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. Eleven 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 <10% and plots treated with fungicide were not significantly different than the nontreated check. SR severity was significantly less in plots treated with Headline AMP alone or with adjuvants compared to the non-treated check. Plots treated with Headline AMP plus Control at both rates and Control Duo significantly decreased SR severity compared to CoRoN, InPlace, Interlock, Liberate, or Headline AMP alone. Stay green, stalk lodging nor yield differences were not significantly different between fungicide + adjuvant treated plots and the nontreated check.