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A Midsouthern Consultant’s Survey on Weed Management Practices in Soybean

Published online by Cambridge University Press:  04 December 2017

Lauren M. Schwartz-Lazaro ,
Jason K. Norsworthy ,
Lawrence E. Steckel ,
Daniel O. Stephenson IV ,
Mandy D. Bish ,
Kevin W. Bradley  and
Jason A. Bond
Lauren M. Schwartz-Lazaro*
Affiliation:
Assistant Professor, School of Plant, Environmental, and Soil Sciences, Louisiana State University, Baton Rouge, LA, USA
Jason K. Norsworthy
Affiliation:
Professor, Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, USA
Lawrence E. Steckel
Affiliation:
Associate Professor, Department of Plant Sciences, University of Tennessee, Jackson, TN, USA
Daniel O. Stephenson IV
Affiliation:
Associate Professor, Dean Lee Research Station, Louisiana State University AgCenter, Alexandria, LA, USA
Mandy D. Bish
Affiliation:
Senior Research Specialist, Department of Plant Sciences, University of Missouri, Columbia, MO, USA
Kevin W. Bradley
Affiliation:
Associate Professor, Department of Plant Sciences, University of Missouri, Columbia, MO, USA
Jason A. Bond
Affiliation:
Associate Research Professor, Delta Research and Extension Center, Mississippi State University, Stoneville, MS, USA
*
Author for correspondence: Lauren M. Schwartz-Lazaro, School of Plant, Environmental, and Soil Sciences, Louisiana State University, Baton Rouge, LA 70803. (Email: [email protected])
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Abstract

Soybean consultants from Arkansas, Louisiana, southeast Missouri, Mississippi, and Tennessee were surveyed in 2016 to assess weed management practices and the prevalence of herbicide-resistant weeds in midsouthern U.S. soybean production. The consultants surveyed represented 13%, 28%, 8%, 16%, and 5% of the total soybean area planted in Arkansas, Louisiana, southeast Missouri, Mississippi, and Tennessee, respectively. Of the total scouted area, 78% of the consultants said their growers planted glyphosate-resistant soybean in 2016, with 18% planting glufosinate-resistant (LibertyLink®), primarily due to familiarity with and cost of the technology. Although 94% of the consultants determined that glufosinate was most effective on killing Palmer amaranth, the primary concern associated with controlling herbicide-resistant weeds was the associated cost, followed by return profit and time constraints. Palmer amaranth, morningglory species, horseweed, barnyardgrass, and Italian ryegrass were the five most problematic weeds in soybean across the five states. Palmer amaranth was the most problematic and important weed in each state individually. The increased concern (77% of consultants) with this species was attributed to the rising concern with and occurrence of protoporphyrinogen oxidase–resistant Palmer amaranth. Consultants were of the opinion that more research was needed on cover crops and the new traited technologies in order to improve weed management in soybean.

Keywords

Mark VanGessel, University of DelawareGlufosinateglyphosatebarnyardgrass, Echinochloa crus-galli (L.) Beauv.horseweed, Conyza canadensis (L.) Cronq.Italian ryegrass, Lolium perenne L. ssp. multiflorum (Lam.) Husnotmorningglory, Ipomoea spp.Palmer amaranth, Amaranthus palmeri S. Wats.soybean, Glycine max (L.) Merr.Herbicide resistanceresistance managementweed controlweed management survey
Type
Weed Management-Major Crops
Information
Weed Technology , Volume 32 , Issue 2 , April 2018 , pp. 116 - 125
Copyright
© Weed Science Society of America, 2017 

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