Plant Pathology Department


Date of this Version



Plant Disease Management Reports 6, FC072 (2012).


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


A foliar fungicide early application 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. Seven treatments and a non-treated control were replicated six times in a randomized complete block design. . . . Headline AMP, 10 fl oz/A at VT/R1, the only treatment with a VT/R1 application, exhibited the lowest GLS and CR AUDPC values. Push lodging ranged from 6.7% for Headline AMP, 10 fl oz/A at VT/R1 to 9.3% for Quadris, 6 fl oz/A at V6. Headline AMP, 10 fl oz/A at VT/R1, exhibited the highest level of stay green at 31.1%. 500 count kernel weights ranged from 6.26 oz to 6.35 oz with no statistical differences between treatments. There were no statistical differences in grain moisture or yield among all treatments. Grain moisture at harvest ranged from 14.6% to 14.9% with the highest moisture percentage occurring in Headline AMP, 10 fl oz/A at VT/R1. Yields ranged from 228.6 bu/A to 242.5 bu/A with the highest yield occurring in the non-treated control.