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Phytotoxicity of Clippings from Creeping Bentgrass Treated with Glyphosate

Published online by Cambridge University Press:  20 January 2017

R. M. Goss ,
R. E. Gaussoin  and
A. R. Martin
R. M. Goss*
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583
R. E. Gaussoin
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583
A. R. Martin
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583
*
Corresponding author's E-mail: [email protected]
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Abstract

Recent advances in genetic engineering have led to the development of glyphosate-resistant (GR) crops for genetic markers and selective weed control. The effects of glyphosate residue on turfgrass clippings could be toxic to non-GR species. The objective of this experiment was to determine whether glyphosate would retain activity within clippings of creeping bentgrass when applied to Kentucky bluegrass and perennial ryegrass. Greenhouse-grown ‘Penncross’ and GR ‘ASR-368’ were treated with glyphosate at 2.24 kg/ha. Clippings were collected 1, 3, 7, and 12 d after application and applied to greenhouse-grown Kentucky bluegrass and perennial ryegrass. Kentucky bluegrass and perennial ryegrass dry weight and percent cover were reduced by clippings receiving glyphosate that were harvested 1 and 3 d after glyphosate application from both susceptible and resistant creeping bentgrass. Results indicate that glyphosate remains active in clippings for up to 3 d after treatment within creeping bentgrass clippings. Glyphosate-applied creeping bentgrass clippings will need to be managed to prevent injury to susceptible species.

Keywords

Glyphosatecreeping bentgrass, Agrostis stolonifera L.Kentucky bluegrass, Poa pratensis L.perennial ryegrass, Lolium perenne L.ClippingsglyphosatemulchturfgrassDAT, days after treatmentGR, glyphosate resistantGRCB-G, glyphosate-resistant creeping bentgrass treated with glyphosatePCB-G, Penncross creeping bentgrass treated with glyphosatePCB-UTC, Penncross creeping bentgrass untreated controlUTC, untreated control
Type
Research
Information
Weed Technology , Volume 18 , Issue 3 , September 2004 , pp. 575 - 579
Copyright
Copyright © Weed Science Society of America 

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Footnotes

∗ Publication 14169 University of Nebraska Agricultural Research Division Journal Series.

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