Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/6375
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dc.contributor.authorGetsinger, Kurt D.en_US
dc.contributor.authorSisneros, Daviden_US
dc.contributor.authorTurner, E. Glennen_US
dc.creatorAScI Corporationen_US
dc.creatorUnited States. Bureau of Reclamationen_US
dc.creatorAquatic Plant Control Research Program (U.S.)en_US
dc.creatorEnvironmental Laboratory (U.S.)en_US
dc.date.accessioned2016-03-23T19:55:08Zen_US
dc.date.available2016-03-23T19:55:08Zen_US
dc.date.issued1993-01en_US
dc.identifier.govdocTechnical Report A-93-1en_US
dc.identifier.urihttp://hdl.handle.net/11681/6375en_US
dc.descriptionTechnical Reporten_US
dc.description.abstractThe submersed plant Eurasian watermilfoil (Myriophyllum spicatum L.), continues to adversely impact areas in the high water exchange environment of the Columbia River system. Studies designed to characterize water movement and to evaluate a slow release matrix device (SRMD) for improving the chemical control of that target plant were conducted in the Pend Oreille and Columbia Rivers, Washington, in August 1990. A series of rhodamine WT dye treatments were applied (using conventional, liquid application techniques) to 4-ha plots representing milfoil-dominated riverine and cove sites to estimate potential herbicide contact time. In addition, dye-impregnated SRMDs were deployed in 0.4-ha plots and evaluated for their potential as slow-release herbicide carriers. Dye dissipation data were used to calculate water-exchange half-lives in plots treated with conventional application techniques. Mean half-lives ranged from 8.8 to 12.2 hr in riverine plots, to 36.3 hr in a plot situated in a protected embayment. Half-lives from these 4-ha plots were two to four times longer than half-lives measured in smaller plots (0.4 ha) from previous dye studies conducted in similar locations. In most cases, dye release rates from SRMDs provided water concentrations near the target level of 10 μg/L through 7 days after deployment (DAD). Dye concentrations peaked at 105 to 130 μg/L at 2 DAD in Plot 1 (main channel plot) and 45 to 82 μg/L at 1 DAD in Plot 2 (side channel plot). When compared with herbicide concentration/exposure time relationships developed in separate laboratory experiments, results from these studies suggest that endothall, 2,4-D, and triclopyr are potential candidates for controlling Eurasian watermilfoil in selected locations in the Pend Oreille and Columbia Rivers. When using conventional, liquid herbicide application techniques in these rivers, treaunent sites should be a minimum of 4 ha in size. Results from the SRMD evaluations indicate that this slow-release carrier has potential for improving the control of Eurasian watermilfoil in high water-exchange environments, and a similar herbicide matrix should be evaluated in hydraulic channels and/or the field.en_US
dc.description.sponsorshipUnited States. Army. Corps of Engineers. Seattle Districten_US
dc.description.sponsorshipAquatic Plant Control Research Program (U.S.)en_US
dc.description.sponsorshipUnited States. Army. Corps of Engineersen_US
dc.description.tableofcontentsPreface..................................iv 1-Introduction..................................1 Background..................................1 Objectives..................................3 2-Materials and Methods..................................4 Conventional Dye Applications..................................4 Slow Release Matrix Dye Applications..................................6 3-Results and Discussion..................................10 Conventional Dye Applications..................................10 SRMD Dye Applications..................................13 Potential Use of Herbicides..................................18 4-Conclusions and Recommendations..................................21 Conclusions..................................21 Recommendations..................................21 References..................................23 Appendix A: Slow Release Matrix Device Patent Information..................................A1 Appendix B: River Discharge Rates and Dye Concentrations, Pend Oreille River, Washington..................................B1en_US
dc.format.extent60 pages/8.53 MBen_US
dc.format.mediumPDFen_US
dc.language.isoen_USen_US
dc.publisherU.S. Army Engineer Waterways Experiment Stationen_US
dc.relationhttp://acwc.sdp.sirsi.net/client/en_US/search/asset/1043533en_US
dc.relation.ispartofseriesTechnical Report (Aquatic Plant Control Research Program (U.S.)) ; no.Technical Report A-93-1en_US
dc.rightsApproved for public release; distribution is unlimiteden_US
dc.sourceThis Digital Resource was created from scans of the Print Resourceen_US
dc.subjectEurasian watermilfoilen_US
dc.subjectHerbicidesen_US
dc.subjectHydrillaen_US
dc.subjectRhodamine WTen_US
dc.subjectSlow-releaseen_US
dc.subjectSubmersed plantsen_US
dc.subjectAquatic plantsen_US
dc.subjectWater exchangeen_US
dc.subjectHydrologyen_US
dc.subjectColumbia Riveren_US
dc.subjectPend Oreille Riveren_US
dc.subjectWashingtonen_US
dc.subjectAquatic Plant Control Research Program (U.S.)en_US
dc.titleUse of water exchange information to improve chemical control of eurasian watermilfoil in Pacific Northwest riversen_US
dc.typeReporten_US
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