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1 July 2009 Strategies for Control of Horseweed (Conyza canadensis) and Other Winter Annual Weeds in No-Till Corn
Gregory R. Armel, Robert J. Richardson, Henry P. Wilson, Thomas E. Hines
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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.

Nomenclature: Acetochlor; atrazine; glyphosate-Tms (trimethylsulfonium salt); mesotrione; paraquat; annual bluegrass, Poa annua L. POAAN; horseweed, Conyza canadensis (L.) Cronq. ERICA; yellow woodsorrel, Oxalis stricta L. OXAST; corn, Zea mays L.

Gregory R. Armel, Robert J. Richardson, Henry P. Wilson, and Thomas E. Hines "Strategies for Control of Horseweed (Conyza canadensis) and Other Winter Annual Weeds in No-Till Corn," Weed Technology 23(3), 379-383, (1 July 2009). https://doi.org/10.1614/WT-08-094.1
Received: 27 June 2008; Accepted: 1 April 2009; Published: 1 July 2009
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KEYWORDS
Burndown
herbicide combinations
herbicide mixtures
nonselective herbicides
preemergence
weed resistance management
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