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Weed Management in Glyphosate Resistant Soybean: Weed Emergence Patterns in Relation to Glyphosate Treatment Timing

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

Knowing when weed species are likely to emerge can aid in developing effective integrated weed management programs. When using nonresidual herbicides such as glyphosate for weed control, treatment timing is critical. This study characterized the emergence patterns of common lambsquarters, common sunflower, common waterhemp, eastern black nightshade, ivyleaf morningglory, shattercane, and woolly cupgrass in soybean, in relation to common glyphosate application timings. Approximately 90% or more of common lambsquarters, common sunflower, and common waterhemp seedlings emerged before the end of May, both in 2000 and 2001. Both ivyleaf morningglory and shattercane emerged from late April to mid-August, allowing these species to avoid glyphosate applications timed to prevent early-season weed competition. Avoidance through periodicity in emergence underscores the importance of integrating multiple tactics to ensure that difficult to manage weeds are not selected for in this management 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’Cohortsgerminationgrowing degree daysheat unitsintegrated weed managementperiodicityDAP, days after plantingIWM, integrated weed managementPOST, postemergence
Type
Research
Information
Weed Technology , Volume 18 , Issue 2 , June 2004 , pp. 277 - 283
Copyright
Copyright © Weed Science Society of America 

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