NAME: COMPANY: ADDRESS: CITY/STATE/ZIP: PHONE: FAX: EMAIL: Von R. Pope Chelan County Public Utility District 231 N. Wenatchee Ave Wenatchee, WA, 98801 509-661-4625 509-661-8108 [email protected] ABSTRACT TITLE: “Chelan PUD’s Integrated Weed Management Program” SESSION: Aquatics Session, Thursday, November 6th, 2:20-2:45 p. m. Since the late 1990’s Chelan County PUD has managed an integrated approach to control a variety of weed species on public land in both Chelan and Douglas Counties for both upland and riparian habitats. Chelan PUD owns a large number of parcels that include riparian habitats associated with Rocky Reach and Rock Island Reservoirs. Riparian areas are particularly challenging along the reservoirs due to access issues, tighter regulations, and, in some areas, the occurrence of a federally listed plant. Chelan PUD and its contractors have used biological, chemical, and physical controls to address a variety of weed issues including purple loosestrife and Japanese knotweed on a large scale. In addition to spraying purple loosestrife, we have released over 10,000 insects to control purple loosestrife over the last decade. However, purple loosestrife still persists. We have controlled several patches of Japanese knotweed along Rock Island Reservoir over a 5 –year period with routine spraying and physical controls. On a much finer scale, we targeted individual plants of Himalayan blackberry and yellow flag iris for the benefit of a federally listed plant. Initial treatments at these sites appear to be working and similar work is begin planned for the future.