Evaluation of diquat, endothall, and diquat plus endothall under short exposure times for the management of flowering rush

Water exchange evaluations at multiple flowering rush sites during 2018 and 2019 demonstrated that rhodamine WT (RWT) dye dissipated quickly, and dye half-lives ranged between 0.5 and 8.0 h. Currently, there are limited strategies for providing longterm selective control of flowering rush, particula...

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Published inJournal of aquatic plant management Vol. 59; no. 1; pp. 52 - 56
Main Authors Sartain, Bradley T, Getsinger, Kurt D, Walter, Damian J
Format Journal Article
LanguageEnglish
Published Gainesville Aquatic Plant Management Society 01.01.2021
Aquatic Plant Management Society, Inc
Subjects
Analysis
Aquariums
Aquatic plants
Biomass
Butomus umbellatus
Diquat
Dyes
Flowering
Herbicides
Indigenous plants
Labeling
Lakes
Plant communities
R&D
Research & development
Rhizomes
Rhodamine
Shorelines
Water exchange
Minnesota
Columbia River
Detroit Michigan
United States > US
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Summary:Water exchange evaluations at multiple flowering rush sites during 2018 and 2019 demonstrated that rhodamine WT (RWT) dye dissipated quickly, and dye half-lives ranged between 0.5 and 8.0 h. Currently, there are limited strategies for providing longterm selective control of flowering rush, particularly in hydrodynamic systems. Additional larger scale field demonstrations at Detroit Lakes, MN, ultimately showed that multiple diquat treatments annually were effective in reducing above- and belowground biomass as well as rhizome bud density with minimal adverse effects on native plant communities (Madsen et al. 2013, Madsen et al. 2016b, Turnage et al. 2016). [...]a commercially available premix formulation of diquat plus endothall (hereafter referred to as diquat plus endothall) has not been previously evaluated for flowering rush control. [...]the objective of this study was to evaluate maximum concentrations of the herbicides diquat, endothall, and diquat plus endothall, across a range of short exposure times, for managing flowering rush. [...]diquat plus endothall labeling allows for drip or metered applications in nonirrigation, flowing water sites (United Phosphorous Inc. 2017); whereas other available aquatic use diquat products do not have the necessary labeling language for these applications. [...]providing these data is beneficial for resources managers because it offers supporting documentation to pursue proper permitting and the development of appropriate management plans linked to water exchange processes specific to the targeted treatment area, particularly in sites where a drip or metered application might be warranted.
ISSN:0146-6623