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17 April 2019 Simulated mechanical control of flowering rush (Butomus umbellatus) under mesocosm conditions
Gray Turnage, John D. Madsen, Ryan M. Wersal, John D. Byrd
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Abstract

Flowering rush (Butomus umbellatus L.) is an invasive aquatic and wetland plant capable of developing monotypic stands in emergent and submersed sites. This plant can rapidly outcompete native vegetation and impede human practices by reducing recreation (boating, fishing, and skiing) and disrupting agricultural use of water resources (irrigation canals). Mechanical removal practices occurring biweekly, monthly, bimonthly, and once per growing season were compared with chemical control with diquat applied sequentially at 0.19 ppmv ai for two consecutive months over 2 yr (2016 and 2017). Biweekly removal gave the most consistent control of B. umbellatus biomass and propagules. Diquat application along with monthly and bimonthly clippings gave varying degrees of B. umbellatus control. Clipping once per growing season did not control B. umbellatus when compared with reference plants, while clipping B. umbellatus every 2 wk (biweekly) controlled rush propagules most effectively. However, it is unlikely this method will be sufficient as a stand-alone control option due to the slow speed of harvester boats, the potential these boats have to spread B. umbellatus propagules to more sites, and the expense of mechanical operations. However, clipping could be used as part of an integrated strategy for B. umbellatus control.

© Weed Science Society of America, 2019
Gray Turnage, John D. Madsen, Ryan M. Wersal, and John D. Byrd "Simulated mechanical control of flowering rush (Butomus umbellatus) under mesocosm conditions," Invasive Plant Science and Management 12(2), 120-123, (17 April 2019). https://doi.org/10.1017/inp.2019.6
Received: 26 October 2018; Accepted: 20 February 2019; Published: 17 April 2019
KEYWORDS
Clipping
harvesting
invasive species
nonchemical control
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