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Influence of Fall and Early Spring Herbicide Applications on Winter and Summer Annual Weed Populations in No-Till Corn

Published online by Cambridge University Press:  20 January 2017

Nicholas Monnig  and
Kevin W. Bradley
Nicholas Monnig
Affiliation:
Division of Plant Sciences, University of Missouri, Columbia, MO 65211
Kevin W. Bradley*
Affiliation:
Division of Plant Sciences, University of Missouri, Columbia, MO 65211
*
Corresponding author's E-mail: bradleyke@missouri.edu
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Abstract

Field experiments were conducted in Missouri in 2004 through 2006 to compare the efficacy of fall and spring herbicide treatments for control of winter and summer annual weeds in no-tillage corn. Applications in the fall and 45 d before planting (45 PP) of 2,4-D and simazine; rimsulfuron, thifensulfuron, and 2,4-D; or glyphosate and 2,4-D controlled at least 90% of all winter annual weeds through 1 wk after corn planting (WAP), with a few exceptions. Applications made 30 d before planting (30 PP) of 2,4-D and glyphosate or rimsulfuron, thifensulfuron, and 2,4-D provided greater than 90% control of most winter annual weeds 1 WAP. Winter annual weed control was reduced with herbicide treatments applied 7 d before planting (7 PP), compared with earlier application timings. Summer annual weed control 5 WAP increased as the time between application and planting decreased. Fall applications resulted in greater weed biomass 5 WAP, compared with spring applications.

Keywords

2,4-Dglyphosaterimsulfuronsimazinethifensulfuroncorn, Zea mays L. ‘Pioneer 34B23’Fall herbicide applicationsherbicide application timingno-tillweed biomassweed emergencewinter annuals
Type
Research
Information
Weed Technology , Volume 22 , Issue 1 , March 2008 , pp. 42 - 48
Copyright
Copyright © Weed Science Society of America 

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