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Horseweed (Conyza canadensis) Control in No-Tillage Soybeans (Glycine max) with Preplant and Preemergence Herbicides

Published online by Cambridge University Press:  12 June 2017

Joseph A. Bruce  and
James J. Kells
Joseph A. Bruce
Affiliation:
Dep. Crop Soil Sci., Mich. State Univ., East Lansing, MI 48824
James J. Kells
Affiliation:
Dep. Crop Soil Sci., Mich. State Univ., East Lansing, MI 48824
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Abstract

Research was conducted in 1987 and 1988 to identify effective horseweed control strategies in no-tillage soybean production. Paraquat at 560 g ai ha-1 plus metolachlor at 2200 g ai ha-1, linuron at 840 g ai ha-1, and nonionic surfactant at 0.25% (v/v) applied preemergence provided less than 61% horseweed control. Glyphosate at 840 g ai ha-1, 2,4-D ester at 560 g ai ha-1, HOE-39866 at 840 g ai ha-1, or BAS-514 at 70 g ai ha-1 applied early preplant controlled more than 96% when followed by the above preemergence herbicide combination. Substituting either glyphosate at 840 g ha-1 or HOE-39866 at 840 g ha-1 for paraquat in the preemergence application program significantly increased control. Adding BAS-514 at 70 g ha-1 to preemergence treatments containing paraquat significantly improved control. The substitution of metribuzin, metribuzin plus chlorimuron (10:1 ratio), or linuron plus chlorimuron (16:1 ratio) for linuron resulted in greater control and soybean yield. Sequential applications controlled horseweed equal to or better than a single preemergence application at the same total rate.

Keywords

BAS-514, 3,7-dichloro-8-quinolinecarboxylic acidchlorimuron, 2-[[[[(4-chloro-6-methoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]benzoic acidglyphosate, N-(phosphonomethyl)glycineHOE-39866, ammonium (3-amino-3-carboxypropyl)methyl phosphinatelinuron, N′-(3,4-dichlorophenyl)-N-methoxy-N-methylureametolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamidemetribuzin, 4-amino-6-(1, 1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-oneparaquat, 1,1-dimethyl-4,4′-bipyridinium ion2,4-D, (2,4-dichlorophenoxy)acetic acidhorseweed, Conyza canadensis (L.) Cronq. ♯3 ERICAsoybean, Glycine max (L.) Merr. ♯ GLXMAApplication timingno-tillBAS-514chlorimuronglyphosateHOE-39866linuronmetribuzinparaquat2,4-DERICA
Type
Research
Information
Weed Technology , Volume 4 , Issue 3 , September 1990 , pp. 642 - 647
Copyright
Copyright © 1990 Weed Science Society of America 

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References

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