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Strategies for Control of Horseweed (Conyza canadensis) and Other Winter Annual Weeds in No-Till Corn

Published online by Cambridge University Press:  20 January 2017

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

Field studies were conducted to determine if mesotrione alone or in combinations with other corn herbicides would control horseweed and other winter annual weeds associated with no-till corn. Mesotrione alone controlled horseweed 52 to 80% by 3 wk after treatment (WAT); however, by 7 WAT control diminished to between 37 to 68%, depending on mesotrione rate. Mesotrione at 0.16 kg ai/ha plus atrazine at 0.28 kg ai/ha controlled 99% of horseweed and annual bluegrass and 88% of yellow woodsorrel. Combinations of mesotrione at 0.16 kg/ha plus acetochlor at 1.79 kg ai/ha plus 1.12 kg ai/ha glyphosate (trimethylsulfonium salt of glyphosate) or 0.7 kg ai/ha paraquat provided 93% or greater control of all three weed species. Glyphosate alone also controlled all weed species 97 to 99%, while paraquat alone provided 99% control of annual bluegrass, 72% control of horseweed, and 36% control of yellow woodsorrel. Mixtures of paraquat plus acetochlor improved control of horseweed (93%) and yellow woodsorrel (73%) over control with either herbicide applied alone.

Keywords

Acetochloratrazineglyphosate-Tms (trimethylsulfonium salt)mesotrioneparaquatannual bluegrass, Poa annua L. POAANhorseweed, Conyza canadensis (L.) Cronq. ERICAyellow woodsorrel, Oxalis stricta L. OXASTcorn, Zea mays L.Burndownherbicide combinationsherbicide mixturesnonselective herbicidespreemergenceweed resistance management
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 23 , Issue 3 , September 2009 , pp. 379 - 383
Copyright
Copyright © Weed Science Society of America 

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