Plant Pathology Department


Date of this Version



Plant Diseases Management Reports 8, FC187 (2013).


Copyright © 2013 The American Phytopathological Society. Used by permission.


A foliar fungicide efficacy trial was conducted at the University of Nebraska-Lincoln South Central Agricultural Laboratory near Clay Center, NE. Corn hybrid NK ‘N68B’, rating of “fair” (7 out of 9) for gray leaf spot (GLS), not rated for common rust (CR), and “excellent” (2 out of 9) for southern rust (SR), was planted on 15 May in 30-in. rows at a target population of 31,763 plants/A. The trial area was disked with corn as the previous year’s crop. Eight treatments and a non-treated control were replicated six times in a randomized complete block design. Each plot was four rows (10 ft) wide by 40 ft in length. . . . There were significant differences among treatments for SR AUDPC as the nontreated control had a statistically larger SR AUDPC compared to all treatments. Stay green percentages ranged from 50.7 % to 56.9%. Percent lodging ranged from 0.8% to 6.7%. Grain moisture at harvest ranged from 16.8% to 17.0%. There were no significant differences among treatments for stay green, lodging, or grain moisture. The non-treated control had a yield of 200.8 bu/A. Yields for fungicide treatments ranged from 197.1 bu/A for Quilt Xcel 2.2 SE, 10.5 fl oz/A, to 212.2 bu/A for Aproach 2.08 SC, 5.6 fl oz/A, + Alto 0.83 SL, 5.6 fl oz/A. There were significant differences among treatments for yield.