Assessment of Weed Control Strategies for Corn in the North-Central United States

Field experiments were conducted across the north-central United States to determine the benefits of various weed control strategies in corn. Weed control, corn yield, and economic return increased when a preemergence (PRE) broad-spectrum herbicide was followed by (fb) postemergence (POST) herbicide...

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Bibliographic Details
Published in:Weed technology 2004-04, Vol.18 (2), p.203-210
Main Authors: Brent E. Tharp, James J. Kells, Thomas T. Bauman, R. Gordon Harvey, Johnson, William G., Mark M. Loux, Alex R. Martin, Douglas J. Maxwell, Micheal D. K. Owen, Regehr, David L., Jon E. Warnke, Wilson, Robert G., Leon J. Wrage, Bryan G. Young, Caleb D. Dalley
Format: Article
Language:English
Subjects:
Agricultural soils
Biological and medical sciences
Broadleaf weeds
Corn
Cost control
Crop science
Fundamental and applied biological sciences. Psychology
Gross margins
Herbicides
Parasitic plants. Weeds
Phytopathology. Animal pests. Plant and forest protection
Planting
Silts
Weed control
Weeds
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Summary:Field experiments were conducted across the north-central United States to determine the benefits of various weed control strategies in corn. Weed control, corn yield, and economic return increased when a preemergence (PRE) broad-spectrum herbicide was followed by (fb) postemergence (POST) herbicides. Weed control decisions based on field scouting after a PRE broad-spectrum herbicide application increased weed control and economic return. Application of a PRE grass herbicide fb a POST herbicide based on field scouting resulted in less control of velvetleaf and morningglory species, corn yield, and economic return compared with a PRE broad-spectrum herbicide application fb scouting. Cultivation after a PRE broad-spectrum herbicide application increased weed control and corn yield compared with the herbicide applied alone, but economic return was not increased. An early-postemergence herbicide application fb cultivation resulted in the highest level of broadleaf weed control, the highest corn yield, and the greatest economic return compared with all other strategies. Weed control based on scouting proved to be useful in reducing the effect of weed escapes on corn yield and increased economic return compared with PRE herbicide application alone. However, economic return was not greater than the PRE fb planned POST or total POST strategies.
ISSN:0890-037X
1550-2740
DOI:10.1614/WT01-68