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Brazilian peppertree and mangrove species response to foliar-applied novel auxin-type herbicides

Published online by Cambridge University Press:  05 May 2020

Stephen F. Enloe*
Affiliation:
Associate Professor, Agronomy Department, University of Florida, Center for Aquatic and Invasive Plants, Gainesville, FL, USA
James K. Leary
Affiliation:
Assistant Professor, Agronomy Department, University of Florida, Center for Aquatic and Invasive Plants, Gainesville, FL, USA
Candice M. Prince
Affiliation:
Assistant Professor, Agronomy Department, University of Florida, Center for Aquatic and Invasive Plants, Gainesville, FL, USA
Benjamin P. Sperry
Affiliation:
Research Assistant Scientist, University of Florida, Agronomy Department, Center for Aquatic and Invasive Plants, Gainesville, FL, USA
Dwight K. Lauer
Affiliation:
Analyst, Silvics Analytic, Wingate, NC, USA
*
Author for correspondence: Stephen F. Enloe, Center for Aquatic and Invasive Plants, 7922 NW 71st Street, Gainesville, FL32653 (Email: sfenloe@ufl.edu)

Abstract

Brazilian peppertree (Schinus terebinthifolia Raddi) is an invasive shrub that is problematic in both freshwater wetlands and brackish mangrove communities. The complex structure, geographic remoteness, and general herbicide sensitivity of mangrove systems have resulted in great technical challenges for managers attempting selective S. terebinthifolia control. Recent advances in auxin herbicide technologies warrant herbicide screening to address this growing problem. Therefore, greenhouse experiments were conducted in 2018 and 2019 to evaluate four non-target mangrove species and S. terebinthifolia response to the three herbicides: aminocyclopyrachlor, aminopyralid, and florpyrauxifen-benyzl. Aminocyclopyrachlor controlled S. terebinthifolia, but was highly injurious to black mangrove [Avicennia germinans (L.) L.], red mangrove (Rhizophora mangle L.), white mangrove [Laguncularia racemosa (L.) C.F. Gaertn.], and buttonwood mangrove (Conocarpus erectus L.). Aminopyralid also controlled S. terebinthifolia but its impact varied across mangrove species. Laguncularia racemosa and C. erectus were highly sensitive to aminopyralid, R. mangle exhibited dose-dependent tolerance, and A. germinans was highly tolerant. Florpyrauxifen-benzyl failed to control S. terebinthifolia and resulted in severe injury to all four mangrove species. These results indicate differential responses to newer auxins in both the target response and non-target plant community of interest. The efficacy of aminopyralid on S. terebinthifolia, coupled with its selectivity on A. germinans warrants further testing.

Type
Research Article
Copyright
© Weed Science Society of America, 2020

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Footnotes

Associate Editor: Ryan M. Wersal, Minnesota State University

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