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Sequential Aminopyralid and Imazapyr Applications for Japanese Knotweed (Fallopia japonica) Management

Published online by Cambridge University Press:  28 September 2017

Nathan S. Boyd ,
Scott N. White  and
Todd Larsen
Nathan S. Boyd
Affiliation:
Associate Professor, Gulf Coast Research and Education Center, University of Florida, Balm, FL 33598
Scott N. White*
Affiliation:
Assistant Professor and Former Graduate Student, Dalhousie University, Truro, NS B2N 5E3, Canada
Todd Larsen
Affiliation:
Assistant Professor and Former Graduate Student, Dalhousie University, Truro, NS B2N 5E3, Canada
*
*Corresponding author’s E-mail: Scott.White@dal.ca
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Abstract

Japanese knotweed is an invasive plant that occurs along waterways, highways, abandoned agricultural land, and other disturbed areas. It reduces plant diversity and can increase shoreline erosion. An experiment was conducted in Bible Hill and Antigonish, NS, Canada to evaluate early POST aminopyralid at 120 g ae ha−1 and POST imazapyr applications at 720 g ae ha−1 at maximum shoot height, flowering, senescence, maximum height+flowering, maximum height+senescence, flowering+senescence, and maximum height+flowering+senescence. Early POST aminopyralid only provided 10% to 15% control at 52 wk after treatment (WAT) whereas 83% to 100% control occurred following imazapyr applications at all application timings. Percent control at 2, 4, and 8 WAT tended to be higher where imazapyr followed aminopyralid. By 52 WAT, equivalent damage ratings and reductions in stem density occurred at both sites in all plots where imazapyr was applied. The use of aminopyralid or multiple imazapyr applications provided no additional benefit over a single imazapyr application. We conclude that early POST aminopyralid suppresses knotweed growth, which should facilitate late-season imazapyr applications, especially in large stands.

Keywords

AminopyralidimazapyrJapanese knotweed, Polygonum cuspidatum Sieb. & Zucc., syn. Fallopia japonica (Houtt.) Dcne. POLCUInvasive speciesearly POST herbicideriparian zone
Type
Research and Education
Information
Invasive Plant Science and Management , Volume 10 , Issue 3 , September 2017 , pp. 277 - 283
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this paper: Steven S. Seefeldt, University of Alaska, Fairbanks.

References

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