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Concentration–Exposure Time Relationships for Controlling Sago Pondweed (Stuckenia pectinata) with Endothall

Published online by Cambridge University Press:  20 January 2017

Jeremy G. Slade ,
Angela G. Poovey  and
Kurt D. Getsinger
Jeremy G. Slade*
Affiliation:
Department of Wildlife and Fisheries, Mississippi State University, 3909 Halls Ferry Road, Vicksburg, MS 39180
Angela G. Poovey
Affiliation:
U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS 39180
Kurt D. Getsinger
Affiliation:
Department of Wildlife and Fisheries, Mississippi State University, 3909 Halls Ferry Road, Vicksburg, MS 39180
*
Corresponding author's E-mail: Jeremy.g.slade@erdc.usace.army.mil
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Abstract

The submersed macrophyte, sago pondweed, frequently grows to nuisance levels in water conveyance systems throughout the western United States and can cause problems in lakes, reservoirs, and other water bodies. The liquid dipotassium and dimethylalkylamine salt formulations of endothall were evaluated for controlling sago pondweed using short exposure times (3 to 24 h) under controlled environmental conditions (14:10 h light:dark; 21.5 C). Endothall treatments ranged from 1 to 10 mg ai/L (dipotassium salt) and 0.5 to 5 mg ae/L (dimethylalkylamine salt). Sixteen concentration and exposure time (CET) combinations were evaluated in each study. At 4 wk after treatment, all CET combinations significantly reduced shoot biomass (43 to 99%) of sago pondweed compared with the untreated reference. Reduction in shoot biomass was greater in plants that received higher herbicide doses and longer exposure times. In addition, more than half of the endothall CET combinations controlled sago pondweed by at least 90%, with some providing > 98% control. At the endothall CETs evaluated, regrowth of sago pondweed could occur after 4 wk, and some level of retreatment might be required to maintain plant control throughout the growing season. Results indicate that endothall shows promise as an alternative vegetation management tool in flowing-water environments.

Keywords

Endothallsago pondweed, Stuckenia pectinata (L.) Boerner PTMPEAquatic weed controlchemical controlirrigation canalssubmersed aquatic vegetation
Type
Research
Information
Weed Technology , Volume 22 , Issue 1 , March 2008 , pp. 146 - 150
Copyright
Copyright © Weed Science Society of America 

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