Plant Pathology Department


Date of this Version



Plant Disease Management Reports 6, FC073 (2012).


Copyright © 2012 The American Phytopathological Society. Used by permission.


A foliar fungicide efficacy timing trial was conducted at the University of Nebraska-Lincoln South Central Agricultural Laboratory near Clay Center, NE. DeKalb corn hybrid DKC 62-54, rating of “good” (6 out of 9) for gray leaf spot (GLS) and “excellent” (2 out of 9) for common rust (CR), was planted on 3 May in 30 in. rows with a target population of 32,000 plants/A. The trial area was disked with a crop history of seven years of continuous corn. On 9 May before plant emergence, a herbicide program of Roundup (1 pt/A), Verdict (16 fl oz/A) and Atrazine (1 lb/A) was applied to the trial site. 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 500-count kernel weights as weights ranged from 6.11 oz to 6.39 oz. There were no statistical differences in grain moisture at harvest as percentages ranged from 14.9% to 15.3%. There were no statistical differences between treatments for dry yield. Priaxor, 4 fl oz/A at V6 was the lowest yielding treatment at 231.5 bu/A. Priaxor, 2 fl oz/A at V6 followed by Headline AMP, 10 fl oz/A at R1 was the highest yielding treatment with 244.0 bu/A.