Sponsor
Prepared for the Washington Department of Agriculture under Contract Number K2029
Document Type
Report
Publication Date
11-2016
Abstract
Flowering rush (Butomus umbellatus L.) early detection surveys were conducted in Lake Umatilla during the summer of 2016. Flowering rush is a Class A Noxious Weed in Washington State due to its aggressive nature, ecological and economic impacts, and limited distribution. Dense stands can outcompete native riparian plants, interfere with boating and fishing, and impede irrigation flows. Flowering rush has been reported in eight Washington counties (WSDA 2016) including a large infestation detected during 2008 in the Yakima River, Benton County. Several pioneering populations have since been detected further downstream in Lake Wallula and Lake Umatilla on the Columbia River (Jenifer Parsons, WDOE, personal communication 2015; Miller and Sytsma 2015). This report summarizes surveys conducted along the Washington shoreline of Lake Umatilla in areas that were not covered during 2014 and 2015 surveys. For completeness, results of flowering rush surveys funded by the Oregon Department of Agriculture along the Oregon shoreline of Lake Umatilla, Lake Celilo, and the Lower Columbia River will also be presented.
Rights
Copyright 2016 Portland State University
Persistent Identifier
https://archives.pdx.edu/ds/psu/44402
Citation Details
Miller, Rich and Sytsma, Mark D., "2016 Columbia River Flowering Rush Survey" (2016). Center for Lakes and Reservoirs Publications and Presentations. 68.
https://archives.pdx.edu/ds/psu/44402