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Guar Tolerance to Postemergence Herbicides

Published online by Cambridge University Press:  20 January 2017

Brian L. S. Olson ,
John W. Sij  and
Todd A. Baughman
Brian L. S. Olson*
Affiliation:
Department of Agronomy, Northwest Research and Extension Center, Kansas State University, Colby, KS 67701
John W. Sij
Affiliation:
Texas Agricultural Research and Extension Center, Box 1658, Vernon, TX 78861
Todd A. Baughman
Affiliation:
Texas Agricultural Research and Extension Center, Box 1658, Vernon, TX 78861
*
Corresponding author's E-mail: [email protected]
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Abstract

Guar production in the United States is limited to a relatively small region in the semiarid southern Great Plains of Texas and Oklahoma. The lack of POST broadleaf herbicides is a potential limiting factor to increased production. A greenhouse study was initiated in 2001 at the Texas A&M Research Center near Vernon, TX to evaluate guar tolerance to 10 POST herbicides typically used in soybean or cotton. Guar seedlings were grown in pots, and herbicides with appropriate adjuvants were applied to 3-wk-old seedlings at the registered rate (1×) and twice (2×) the registered rate for soybean or cotton. The study was repeated twice, with six replications in each run. Twenty-eight d after treatment (DAT), visual injury and aboveground dry weight of viable biomass were recorded for each plant. Significant differences (P = 0.05) were noted among herbicides for visual injury and viable biomass. Little or no differences in visual injury and aboveground dry weight were observed between the control (no herbicide applied) and the 1× rate of 4-(2,4-dichlorophenoxy)butanoic acid, bentazon, or imazethapyr 28 DAT. A 1× application rate of acifluorfen, imazamox, thifensulfuron, or bromoxynil caused minor visual injury of 7 to 9% and a reduction in dry weight of 8 to 23%. Pyrithiobac and chlorimuron caused 38 and 47% visible injury and a 35 and 58% reduction in dry weight, respectively. Guar was most sensitive to lactofen, with the 1× rate causing 100% visual injury and no recoverable aboveground biomass. This greenhouse study identified three POST herbicide candidates with potential to control broadleaf weeds in guar without noticeable plant injury, and offers data to support herbicide registrations for this minor crop.

Keywords

Acifluorfenbentazonbromoxynilchlorimuronimazamoximazethapyrlactofenpyrithiobacthifensulfuron2,4-DBcotton, Gossypium hirsutum L.guar, Cyamopsis tetragonoloba (L.) Taub ‘Kinman’soybean, Glycine max (L.) MerrDry beancrop tolerance
Type
Notes
Information
Weed Technology , Volume 21 , Issue 2 , June 2007 , pp. 523 - 525
Copyright
Copyright © Weed Science Society of America 

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References

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