Plant Pathology Department


Date of this Version



Plant Disease Management Reports 6, FC071 (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 2 May in 30 in. rows with a target population of 32,000 plants/A. The trial area was disked with soybean as the previous year’s crop. 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. Ten fungicide treatments and a non-treated control were replicated four times in a randomized complete block design. . . . Generally, the highest levels of stay green occurred in treatments with a VT/R1 application or an application at V5 followed by a VT/R1 application. There were no significant differences among treatments for 500-count kernel weights as weights ranged from 6.04 oz to 6.43 oz. There were statistical differences between treatments in grain moisture as percentages ranged from 15.1 oz to 15.6 oz. There were no statistical differences in yield. Yields ranged from 241.3 bu/A for the nontreated control to 250.0 for Headline, 6 fl oz/A at VT/R1.