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Postharvest Kochia (Kochia scoparia) Management with Herbicides in Small Grains

Published online by Cambridge University Press:  20 January 2017

James A. Mickelson ,
Alvin J. Bussan ,
Edward S. Davis ,
Andrew G. Hulting  and
William E. Dyer
James A. Mickelson*
Affiliation:
Southern Agricultural Research Center, Montana State University, 748 Railroad Highway, Huntley, MT 59037
Alvin J. Bussan
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, P.O. Box 173120, Bozeman, MT 59717-3120
Edward S. Davis
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, P.O. Box 173120, Bozeman, MT 59717-3120
Andrew G. Hulting
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, P.O. Box 173120, Bozeman, MT 59717-3120
William E. Dyer
Affiliation:
Department of Plant Sciences and Plant Pathology, Montana State University, P.O. Box 173150, Bozeman, MT 59717-3150
*
Corresponding author's E-mail: mickelsonjam@yahoo.com
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Abstract

Uncontrolled kochia plants that regrow after small-grain harvest can produce substantial numbers of seeds. An average of 4,100 seeds per plant were produced between harvest (late July to mid August) and the first killing frost (late September) at three locations in Montana. Field experiments were conducted to determine the optimal timing of postharvest herbicide applications to prevent kochia from producing viable seeds. Herbicide treatments were applied at three timings from late August to mid September. The most effective treatments were glyphosate (631 g/ha) and paraquat (701 g/ha) applied at the second application timing (late August to early September). These treatments reduced kochia seed production by 92% or greater at each site. Kochia regrowth by this time had sufficient leaf area for herbicide absorption, but few viable seed had been produced. Herbicide treatments at the first and third application timings were generally less effective and more variable in reducing kochia seed production. Sulfentrazone (157 g/ha) and 2,4-D (561 g/ha) were not as effective at reducing seed production as other herbicide treatments.

Keywords

Glyphosateparaquatsulfentrazone2,4-Dkochia, Kochia scoparia (L.) Schrad. # KCHSCSeed productionAMS, ammonium sulfate
Type
Research
Information
Weed Technology , Volume 18 , Issue 2 , June 2004 , pp. 426 - 431
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: University of Wisconsin, Department of Horticulture, 1575 Linden Drive, Madison, WI 53706-1590
Current address: 6233 Brett Ashley Place, Johnston, IA 50131

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