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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*
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]

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.

Type
Research
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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