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PRE and POST control of Praxelis clematidea, an emerging weed in Florida nursery production

Published online by Cambridge University Press:  11 May 2020

Yuvraj Khamare ,
S. Christopher Marble Open the ORCID record for S. Christopher Marble [Opens in a new window] ,
Nathan S. Boyd  and
Shawn T. Steed
Yuvraj Khamare
Affiliation:
Graduate Research Assistant, University of Florida, Mid-Florida Research and Education Center, Apopka, FL, USA
S. Christopher Marble*
Affiliation:
Assistant Professor, University of Florida, Mid-Florida Research and Education Center, Apopka, FL, USA
Nathan S. Boyd
Affiliation:
Associate Professor, University of Florida, Gulf Coast Research and Education Center, Balm, FL, USA
Shawn T. Steed
Affiliation:
Extension Agent III, University of Florida/Institute of Food and Agricultural Sciences, Hillsborough County, Seffner, FL, USA
*
Author for correspondence: S. Christopher Marble, University of Florida/IFAS Mid-Florida Research and Education Center, 2725 S Binion Road, Apopka, FL32703. Email: marblesc@ufl.edu
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Abstract

Praxelis is an annual to short-lived perennial herb in the Asteraceae family and an emerging problematic weed species in Florida nurseries. The objective of these experiments was to determine efficacy of selected PRE and POST herbicides for control of praxelis. An additional experiment was conducted to determine efficacy of the same PRE herbicides for control of bluemink, a weed similar in appearance to praxelis that is also common in Florida. The granular herbicides dimethenamid + pendimethalin, flumioxazin, oxyfluorfen + pendimethalin, oxyfluorfen + prodiamine, and trifluralin + isoxaben were evaluated, along with spray-applied formulations of dimethenamid, indaziflam, and prodiamine + isoxaben. Flumioxazin consistently provided over 90% control of praxelis at both sites. Indaziflam control was inconsistent between the two sites, providing 100% control in Apopka but only a 22% reduction in weed counts in Balm. Oxyfluorfen + pendimethalin, oxyfluorfen + prodiamine, and prodiamine + isoxaben also provided control (57% to 97% reduction in shoot weight), albeit generally to a lesser degree than was observed with flumioxazin. All PRE herbicides provided similar control of both praxelis and bluemink, with the exception of dimethenamid and dimethenamid + pendimethalin, which reduced bluemink shoot weight more than praxelis. Clopyralid, glyphosate, and triclopyr all provided effective POST control of mature and flowering praxelis through 12 wk after treatment (WAT) and resulted in greater praxelis control than glufosinate. Results suggest that many commonly used PRE and POST herbicides would provide control of praxelis, but use of PRE and POST herbicides as well as sequential applications may be needed for long-term management.

Keywords

Invasivecontainer productionsoilless substrateintroduced speciesClopyraliddimethenamidflumioxazinglufosinateglyphosateindaziflamisoxabenoxyfluorfenpendimethalinprodiaminetriclopyrtrifluralinbluemink, Ageratum houstonianum Mill.praxelis, Praxelis clematidea (Kuntze) R.M. King and H. Rob
Type
Research Article
Information
Weed Technology , Volume 34 , Issue 6 , December 2020 , pp. 779 - 786
Copyright
© Weed Science Society of America, 2020

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Footnotes

Associate Editor: Mark VanGessel, University of Delaware

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