2008 Statewide Strategic Plan for Eurasian Watermilfoil in Idaho

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treatment of Eurasian watermilfoil and is relatively selective to many native aquatic grass species. Triclopyr typically is used for treating isolated Eurasian watermilfoil beds as opposed to whole lake treatments. Triclopyr is a good alternative to fluridone when Eurasian watermilfoil is not abundant throughout an entire water body. One drawback to using triclopyr has been the fact that only a liquid formulation was available, dramatically increasing costs for treatments in deep water areas. In 2007, a granular formulation called Renovate OTF was approved for aquatic use in Idaho. The use of Renovate OTF allows for the bottom portion of the water column to be treated in deeper water before plants reach the water surface. G. Cultural Control Because this plant is so difficult to control once it has become established, prevention and early detection of Eurasian watermilfoil is essential in stopping the plant from becoming a widespread problem in a lake, stream, or river. Human recreational activities account for the majority of invasive aquatic plant spread, and this is especially so for Eurasian watermilfoil in Idaho. Fragments of the plant cling to the propellers of boat motors or trailers and, if not removed, can start new populations when the boat is launched into another water body. To stop further spread, it is imperative that all plant fragments are removed from boats before putting into or leaving a water body’s access area. Once removed, plant material should be properly disposed of in a trash receptacle or on high, dry ground where there is no danger of it washing into any water body. 1. Prevention A prevention program that educates the public about invasive aquatic weeds is a valuable and important part of aquatic management planning in Idaho. This can be accomplished in the form of periodic and frequent newsletters, flyers, and newspaper articles. Neighborhood and stakeholder workshops on the identification of troublesome aquatic species (plant and animal) can encourage citizens and recreationalists to assist with early detection of different aquatic nuisance species. Public monitoring and signage at boat ramps swimming beaches adds to the knowledge of Eurasian watermilfoil in Idaho and builds support for the statewide program (Figure 17). Figure 18. Prevention and awareness signs posted at boat ramps in Idaho. 37
X. Current Eurasian Watermilfoil Management Efforts in Idaho - 2007 The following summaries provide a breakdown of FY 2007 Eurasian watermilfoil projects funded through the ISDA program: A. Statewide 1. Milfoil Task Force Under the authorities and responsibilities established for the Idaho Invasive Species Council (IISC), the Governor directed the IISC to undertake a survey and review of Eurasian watermilfoil in the state. The IISC first assessed the scope of the problem by county, for both risk and actual infestation, and developed a map of these areas. The Milfoil Task Force (MTF) was formed as a sub-committee of the IISC to conduct this work. The Milfoil Task Force was created with specific goals: 1. Identify the extent of Eurasian watermilfoil in Idaho. 2. Research & identify additional means of control and determine efficacy of available controls. 3. Assist and support the Idaho Weed Awareness Campaign in raising public awareness of the problems associated with Eurasian watermilfoil. The Task Force has been conducting surveys of Idaho water bodies since 2000. The Milfoil Task Force inspected water bodies throughout Idaho and maintained a distribution database. The project includes reprioritization of water bodies where Eurasian watermilfoil has not been found and funds to work on bottom barrier efficacy. 2007 Total project cost: $35,271 ISDA Funds: $28,371 Match: $6,900 B. North 1. Bonner County, Sandpoint, Idaho Bonner County treats Lake Pend Oreille using Sonar and Renovate herbicides and bottom barriers. Education and outreach components include signs at boat launches, public notifications, and radio advertisements. A Eurasian watermilfoil information office was set up in the town of Sandpoint. The information office tracked inquires and feedback from the public (see Appendix 4). 2007 Total project cost: $1,882,588 ISDA Funds: $1,814,260 Match: $68,328 38
Page 1 and 2: 2008 STATEWIDE STRATEGIC PLAN FOR E
Page 3 and 4: A Statewide Strategic Plan for Eura
Page 5 and 6: I. Introduction In April 2006 the I
Page 7 and 8: V. Idaho Eurasian Watermilfoil Peer
Page 9 and 10: and contractor oversight to effecti
Page 11 and 12: Figure 3. Eurasian watermilfoil sur
Page 13 and 14: • Task 3: Establish appropriate m
Page 15 and 16: appear first. Eastern Idaho should
Page 17 and 18: B. Description A number of milfoil
Page 19 and 20: and boating activities, with each f
Page 21 and 22: the state. The highest priority wee
Page 23 and 24: and provides assistance to cooperat
Page 25 and 26: the boat with a GPS to the predeter
Page 27 and 28: IX. Eurasian Watermilfoil Managemen
Page 29 and 30: Bottom barriers are appropriate in
Page 31 and 32: emaining root masses. Duration of c
Page 33 and 34: Search for a classical biological c
Page 35 and 36: sources of dilution need to be inve
Page 37: 3. Fluridone Fluridone (Trade names
Page 41 and 42: 2007 Total project cost: $19,400 IS
Page 43 and 44: 2007 Total project cost: $82,660 IS
Page 45 and 46: C. Effect of sediment on efficacy o
Page 47 and 48: scientists and weevils could easily
Page 49 and 50: Surveys for pathogens were restrict
Page 51 and 52: Creed Jr., R.P. and S.P. Sheldon. 1
Page 53 and 54: Komarov, V.L. 1929. Flora poluostro
Page 55 and 56: Moody, M.L., Les, D.H. in Press. Di
Page 57 and 58: Westerdahl, H.E. and K.D. Getsinger
Page 59 and 60: as transparent and publicly availab
Page 61 and 62: to amend if they require legal revi
Page 63 and 64: Recommendation 2.3: Program intent
Page 65 and 66: Excessive uncontrolled growth of aq
Page 67 and 68: species or the reduction of their p
Page 69 and 70: Some or many of these techniques ar
Page 71 and 72: ISDA Response: Given that ISDA does
Page 73 and 74: expertise found in warmer climates.
Page 75 and 76: umors and public fear of management
Page 77 and 78: Option How it Works Pros Cons Suita
Page 83 and 84: Costs include estimated raw materia
Page 85: Office Visits Quantity What is the

2008 Statewide Strategic Plan for Eurasian Watermilfoil in Idaho

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