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Title: Selective control of Eurasian Watermilfoil and Curlyleaf Pondweed in Noxon Rapids Reservoir, Montana : Herbicide small-plot evaluations, 2010-2011
Authors: University of Washington. School of Aquatic & Fishery Sciences.
North Carolina State University. Department of Crop Science.
Geosystems Research Institute.
Aquatic Plant Control Research Program (U.S.)
Getsinger, Kurt D.
Skogerboe, John G.
Wersal, Ryan Michael, 1979-
Madsen, John Douglas.
Nawrocki, Justin J.
Richardson, Robert J. (Robert Jeryl), 1974-
Keywords: Aquatic herbicides
Curlyleaf pondweed
Eurasian watermilfoil
Invasive plants
Noxon Rapids Reservoir
Water exchange processes
Sternberg, Morgan Rachel.
Publisher: Environmental Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: ERDC/EL TR ; 14-4.
Description: Technical Report
Abstract: Noxon Rapids Reservoir, Montana, is one of several large impoundments on the Lower Clark Fork River, stretching for over 48 km (30 miles) with a surface area of ~3,120 ha (7,700 acres). Management strategies were evaluated for their effectiveness in controlling invasive plant problems in the reservoir, specifically with Eurasian watermilfoil and curlyleaf pondweed. A 3-year field program was developed to evaluate the effectiveness of aquatic herbicides to selectively control the invasive plants. The herbicide endothall (Aquathol® K) was applied to four plots totaling 5.5 ha (13.6 acres) at 3000 μg ai/L (3 ppm); diquat (Reward®) applied to four plots totaling 3.3 ha (8.1 acres) at 370 μg ai/L (0.37 ppm); and a combination of both products was applied to four plots totaling 4.7 ha (11.5 acres), with endothall at 1500 μg ai/L (1.5 ppm) and diquat at 190 μg ai/L (0.19 ppm). Herbicides were applied by boat using a variable-depth injection system. Aqueous herbicide dissipation was monitored in selected plots. Bulk water exchange processes were also measured. Quantitative surveys were conducted in each plot to assess the plant community at pretreatment, and at 6 weeks and 52 weeks post treatment. Treatments provided significant reductions in Eurasian watermilfoil (59-69%) and curlyleaf pondweed (40-60%), through 52 weeks post treatment. Both products provided some degree of selective control, with a variety of native plants surviving the treatments.
Appears in Collections:Technical Report

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