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Weed Management in a Glyphosate Resistant Soybean System: Weed Species Shifts

Published online by Cambridge University Press:  20 January 2017

Kari L. Hilgenfeld ,
Alex R. Martin ,
David A. Mortensen  and
Stephen C. Mason
Kari L. Hilgenfeld
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583-0915
Alex R. Martin*
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583-0915
David A. Mortensen
Affiliation:
Department of Crop and Soil Science, Penn State University, University Park, PA 16802
Stephen C. Mason
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583-0915
*
Corresponding author's E-mail: amartin2@unl.edu
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Abstract

With increased reliance on glyphosate for weed control, weed species composition shifts are likely. Changes in relative abundance could arise from differential tolerance or resistance to, or avoidance of, glyphosate. This study characterized the potential changes in seedbank composition of a mixed population of summer annual weeds due to glyphosate application timing. Seven weeds common in soybean fields in the Midwest were introduced at known densities and treated with glyphosate at several treatment timings. Common lambsquarters, common sunflower, common waterhemp, eastern black nightshade, ivyleaf morningglory, shattercane, and woolly cupgrass were selected to represent a range of emergence patterns and tolerances to glyphosate. Seedling emergence and seed production were monitored. Differences in herbicide tolerance and avoidance, through markedly different weed emergence patterns, were strong contributors to projected changes in weed species composition. Lessened sensitivity to glyphosate allowed some emerged species, such as ivyleaf morningglory, to better survive the herbicide. Late emergence allowed others, such as shattercane and ivyleaf morningglory, to avoid glyphosate applications. Such mechanisms may allow specific species to increase in a continuous glyphosate system.

Keywords

Glyphosatecommon lambsquarters, Chenopodium album L.# CHEALcommon sunflower, Helianthus annuus L. # HELANcommon waterhemp, Amaranthus rudis Sauer # AMATAeastern black nightshade, Solanum ptycanthum Dun. ex DC. # SOLPTivyleaf morningglory, Ipomoea hederacea [L.] Jacq. # IPOHEshattercane, Sorghum bicolor [L.] Moench # SORVUwoolly cupgrass, Eriochloa villosa [Thunb.] Kunth # ERBVIsoybean, Glycine max (L.) Merr. ‘Asgrow 3003RR’Differential sensitivityfecundityherbicide tolerancepopulation dynamicsrelative abundanceDAP, days after plantingPOST, postemergenceSBt, seedbank at time = 0SBt+1, seedbank at time = 1 yr
Type
Research
Information
Weed Technology , Volume 18 , Issue 2 , June 2004 , pp. 284 - 291
Copyright
Copyright © Weed Science Society of America 

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