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Mesotrione, Acetochlor, and Atrazine for Weed Management in Corn (Zea mays)

Published online by Cambridge University Press:  20 January 2017

Gregory R. Armel ,
Henry P. Wilson ,
Robert J. Richardson  and
Thomas E. Hines
Gregory R. Armel
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
Henry P. Wilson*
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
Robert J. Richardson
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
Thomas E. Hines
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
*
Corresponding author's E-mail: hwilson@vt.edu
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Abstract

Field studies were conducted in 1999, 2000, and 2001 to investigate weed control and crop safety with preemergence (PRE) and postemergence (POST) applications of mesotrione alone and in tank mixtures with acetochlor and atrazine. Corn injury was less than 4% with all mesotrione treatments in 1999 and 2001, but it was 8 to 20% in 2000, when rainfall was 3.1 cm 7 d after PRE applications. Mesotrione PRE at 0.16 and 0.24 kg ai/ha did not adequately control most broadleaf weeds or giant foxtail. Tank mixtures of mesotrione plus acetochlor controlled smooth pigweed and giant foxtail but did not adequately control common ragweed, common lambsquarters, or morningglory species. Control by tank mixtures of mesotrione plus atrazine at 0.56 kg ai/ha was frequently low and varied with rainfall after PRE applications. All weed species were controlled 80% or more by mesotrione plus acetochlor PRE or atrazine plus acetochlor PRE followed by mesotrione POST at 0.11 kg/ha.

Keywords

Acetochloratrazinemesotrionecommon lambsquarters, Chenopodium album L. #3 CHEALcommon ragweed, Ambrosia artemisiifolia L. # AMBELgiant foxtail, Setaria faberi Herrm. # SETFAmorningglory species, Ipomoea spp. # IPOSSsmooth pigweed, Amaranthus hybridus L. # AMACHcorn, Zea mays LHPPD-inhibiting herbicidestriketone herbicidesCOC, crop oil concentrateDAT, days after treatmentfb, followed byPOST, postemergencePRE, preemergenceUAN, urea ammonium nitrateWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 17 , Issue 2 , June 2003 , pp. 284 - 290
Copyright
Copyright © Weed Science Society of America 

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