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  • Foliar Fungal Assemblages Associated with Diploid and Triploid Butomus umbellatus Populations in the United States

    Purpose: Novel associations between plant invaders and fungi may moderate invader impacts if fungi are pathogenic or contribute to variation in invader response to management. Identifying and quantifying species associations with plant invaders can have management consequences. However, whether novel fungal associations and resulting assemblages are shaped by invader genetics is largely unknown. The goal of this research was to identify community patterns of foliar fungi associated with diseased and healthy diploid and triploid Butomus umbellatus (flowering rush) cytotypes in the United States. A total of 12 diploid and 9 triploid Butomus umbellatus L. populations in 10 states across the northern United States were surveyed, foliar fungi were isolated from healthy and diseased leaves, and a fungal assemblage structure analysis was conducted to determine whether assemblages were unique to B. umbellatus cytotypes. Differences in flowering rush–associated fungal assemblages and complex interaction between fungal taxa may promote uneven invasion between cytotypes in the United States and guide future management efforts to reduce the negative impacts caused by B. umbellatus invasions.

  • 23-037 Corps to treat Lake Wallula to control invasive flowering rush

    WALLA WALLA, WA– The U.S. Army Corps of Engineers Walla Walla District will be performing up to five five-acre treatments in Lake Wallula, the McNary reservoir near the Tri-Cities, Washington, with herbicide, Diquat Dibromide, at an application rate of two gallons per surface acre. This effort is to control the invasive aquatic plant species flowering rush.

  • Flowering Rush Control in Hydrodynamic Systems: Part 1: Water Exchange Processes

    Abstract: In 2018, field trials evaluated water-exchange processes using rhodamine WT dye to provide guidance on the effective management of flowering rush (Butomus umbellatus L.) at McNary Dam and Reservoir (Wallula Lake, 15,700 ha). Additional evaluations determined the effectiveness of BubbleTubing (hereafter referred to as bubble curtain) at reducing water exchange within potential flowering rush treatment areas. Dye readings were collected from multiple sampling points at specific time intervals until a dye half-life could be determined. Whole-plot dye half-lives at sites without bubble curtain ranged 0.56–6.7 h. In slower water-exchange sites (≥2.6 h dye half-life), the herbicide diquat should have a sufficient contact time to significantly reduce flowering rush aboveground biomass. Other sites demonstrated very rapid water exchange (<1.5 h dye half-life), likely too rapid to effectively control flowering rush using chemical treatments without the use of a barrier or curtain to slow water exchange. At one site, the use of the bubble curtain increased the dye half-life from 3.8 h with no curtain to 7.6 and 7.1 h with a bubble curtain. The bubble curtain’s ability to slow water exchange will provide improved chemical control and increase the potential for other chemical products to be effectively used.

  • 22-056 Corps to treat Lake Wallula to control invasive flowering rush

    KENNEWICK, Wash.– The U.S. Army Corps of Engineers’ Walla Walla District will be performing up to eight five-acre treatments in Lake Wallula, the McNary reservoir near Tri-Cities, Washington, with herbicide, Diquat Dibromide, at an application rate of two gallons per surface acre. This effort is to control the invasive aquatic plant species flowering rush.

  • Corps of Engineers partners with states in fight against invasive aquatic plants

    Butomus umbellatus may conjure up images of a hippopotamus belly, but in reality, it is flowering rush, an aquatic invasive plant species that poses a grave threat to the Columbia River Basin’s aquatic ecosystems.

  • U.S. Army Corps of Engineers and Cleveland Museum of Natural History execute agreement

    The U.S. Army Corps of Engineers, Buffalo District and the Cleveland Museum of Natural History executed a Project Partnership Agreement, August 10, 2020 to begin a project that will control flowering rush at Mentor Lagoons Nature Preserve and Mentor Marsh State Nature Preserve located on the southern shore of Lake Erie in the City of Mentor, OH.

  • 19-71 Corps invites comments on draft EA for invasive aquatic weed control

    The U.S. Army Corps of Engineers’ Walla Walla District invites public comments on a Draft Environmental Assessment (EA) for flowering rush control in the states of Washington, Idaho, Oregon and Montana. Comments will be accepted June 24, 2019 through July 24, 2019.