Plant Pathology Department


Date of this Version



Plant Disease Management Reports 6, FC076 (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 5 May in 30 in. rows with a target population of 32,000 plants/A. The trial area had 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. Nine 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. . . . Treatments with a R1 application timing typically had a higher percentage of stay green compared with the V5 application timing treatments. There were no significant differences among treatments for 500-count kernel weights. There were statistical differences in grain moisture as moisture percentages at harvest ranged from 14.9% to 15.3% with the nontreated control exhibiting the lowest moisture level. There were no statistical differences between treatments for yield. Evito T, 5 fl oz/A at V5 was the highest yielding treatment with 243.4 bu/A.