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Native Grass Establishment following Application of Pyridine Herbicides

Published online by Cambridge University Press:  12 April 2017

Rodney G. Lym ,
Roger L. Becker ,
Michael J. Moechnig ,
Mary B. Halstvedt  and
Vanelle F. Peterson
Rodney G. Lym*
Affiliation:
Professor, Plant Sciences Department, North Dakota State University, Fargo, ND 58105
Roger L. Becker
Affiliation:
Professor, Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108
Michael J. Moechnig
Affiliation:
Field Scientist, Research and Development, Dow AgroSciences, Toronto, SD 57268;
Mary B. Halstvedt
Affiliation:
Field Research Biologist, Research and Development, Dow AgroSciences, Billings, MT 59102
Vanelle F. Peterson
Affiliation:
Senior Research Scientist, Research and Development, Dow AgroSciences, Fort Collins, CO 80527
*
*Corresponding author’s E-mail: [email protected]
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Abstract

Invasive species management is often more successful if desirable species are seeded after the target weed is controlled. However, control of invasive plants must be maintained following reseeding or the seeded species may fail to establish. A regional study conducted in Minnesota, North Dakota, and South Dakota evaluated the effect of aminopyralid, clopyralid, or picloram applied in the fall prior to fall-dormant seeding or seeding the following spring on cool- and warm-season native grass species establishment. Herbicides were applied at standard rates used to control invasive broadleaf weeds in the upper midwestern tallgrass prairie region of the United States. Cool-season species included Canada wildrye, green needlegrass, and intermediate wheatgrass. Warm-season species included big bluestem, little bluestem, sideoats grama, switchgrass, and Indiangrass. Aminopyralid did not reduce seedling establishment in either fall or spring seeding. Grasses generally were not affected by a pretreatment of the pyridine standards clopyralid or picloram either, with the exception of a slight reduction in fall-seeded establishment of intermediate wheatgrass. Picloram also slightly reduced fall-seeded establishment of Canada wildrye. Application of aminopyralid can safely be used to control susceptible invasive species preceding grass species establishment, with a safety margin similar to or slightly better than that with the pyridine standards clopyralid or picloram.

Keywords

Aminopyralidclopyralidpiclorambig bluestem (Andropogon gerardii Vitman)Canada wildrye (Elymus canadensis L.)green needlegrass [Nassella viridula (Trin.) Barkworth]indiangrass [Sorghastrum nutans (L.) Nash]intermediate wheatgrass [Thinopyrum intermedium (Host) Barkworth & D. R. Dewey]little bluestem [Schizachyrium scoparium (Michx.) Nash]sideoats grama [Bouteloua curtipendula (Michx.) Torr.]switchgrass (Panicum virgatum L.)Invasive weed controlreseedingrevegetation
Type
Research and Education
Information
Invasive Plant Science and Management , Volume 10 , Issue 1 , March 2017 , pp. 110 - 117
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this paper: Stephen F. Enloe, University of Florida.

References

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