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Ryegrass (Lolium multiflorum) Control in Winter Wheat (Triticum aestivum)

Published online by Cambridge University Press:  12 June 2017

James L. Griffin
James L. Griffin*
Affiliation:
Rice Res. Stn., Louisiana Agric. Exp. Stn., P.O. Box 1429, Crowley, LA 70527-1429
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Abstract

Ryegrass (Lolium multiflorum Lam. # LOLMU) control in wheat (Triticum aestivum L.) using chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl) amino] carbonyl] benzenesulfonamide} at 35 g ai/ha was significantly higher when applied preemergence (pre) than early postemergence (poe) to ryegrass with two to four leaves and wheat with three to five tillers. Metribuzin [4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one] applied at 420 g ai/ha early poe controlled more than 95% of the ryegrass, but control was unacceptable when the same rate was applied late poe when the ryegrass was at midtiller and wheat at full tiller. Wheat leaf burn, stunting, and stand reduction occurred where metribuzin was applied early poe but yields were not affected. Ryegrass control was excellent where diclofop {(±)-2-[4-(2,4-dichlorophenoxy)phenoxy] propanoic acid} was applied early poe at 560 g ai/ha. Wheat yields, averaged over years, for early poe applications of chlorsulfuron at 35 g/ha, metribuzin at 280 and 420 g/ha, and diclofop at 560 g/ha were 22, 22, 24, and 20% higher, respectively, than the untreated stands. Injury associated with the herbicide treatments was not observed on soybeans [Glycine max (L.) Merr.] planted following wheat.

Keywords

WheatchlorsulfuronmetribuzindiclofopLOLMU
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 34 , Issue 1 , January 1986 , pp. 98 - 100
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

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