Aquatic Plant Management Society, Inc.
http://hdl.handle.net/1834/17538
2024-03-29T09:33:33ZPanel Discussion - Management of Eurasian watermilfoil in the United States using native insects: State regulatory and management issues
http://hdl.handle.net/1834/19786
Panel Discussion - Management of Eurasian watermilfoil in the United States using native insects: State regulatory and management issues
Madsen, John D.; Crosson, H. A.; Hamel, K. S.; Hilovsky, M. A.; Welling, C. H.
While researchers have evaluated the potential of nativeinsect herbivores to manage nonindigenous aquatic plantspecies such as Eurasian watermilfoil (Myriophyllum spicatumL.), the practical matters of regulatory compliance and implementationhave been neglected. A panel of aquatic nuisancespecies program managers from three state naturalresource management agencies (Minnesota, Vermont andWashington) discussed their regulatory and policy concerns.In addition, one ecological consultant attempting to marketone of the native insects to manage Eurasian watermilfoiladded his perspective on the special challenges of distributinga native biological control agent for management of Eurasianwatermilfoil.
2000-01-01T00:00:00ZRelationship between water quality, watermilfoil frequency, and weevil distribution in the State of Washington
http://hdl.handle.net/1834/19784
Relationship between water quality, watermilfoil frequency, and weevil distribution in the State of Washington
Tamayo, Mariana; Grue, Christian E.; Hamel, Kathy
During the summer of 1997, we surveyed 50 waterbodiesin Washington State to determine the distribution of theaquatic weevilEuhrychiopsis leconteiDietz. We collected dataon water quality and the frequency of occurrence of watermilfoilspecies within selected watermilfoil beds to comparethe waterbodies and determine if they were related to thedistribution E. lecontei. We foundE. leconteiin 14 waterbodies,most of which were in eastern Washington. Only one lakewith weevils was located in western Washington. Weevils wereassociated with both Eurasian (Myriophyllum spicatumL.) andnorthern watermilfoil (M. sibiricumK.). Waterbodies withE.leconteihad significantly higher (P< 0.05) pH (8.7±0.2)(mean±2SE), specific conductance (0.3±0.08 mS cm-1) andtotal alkalinity (132.4±30.8 mg CaCO3L-1). We also foundthat weevil presence was related to surface water temperatureand waterbody location ( = 24.3,P≤0.001) and of allthe models tested, this model provided the best fit (Hosmer-Lemeshow goodness-of-fit = 4.0,P= 0.9). Our results suggestthat in Washington StateE. leconteioccurs primarily ineastern Washington in waterbodies with pH≥8.2 and specificconductance≥0.2 mS cm-1. Furthermore, weevil distributionappears to be correlated with waterbody location (easternversus western Washington) and surface water temperature.
2000-01-01T00:00:00ZFactors to consider when using native biological control organisms to manage exotic plants
http://hdl.handle.net/1834/19785
Factors to consider when using native biological control organisms to manage exotic plants
Cofrancesco, Alfred F.
Biological control of exotic plant populations with nativeorganisms appears to be increasing, even though its successto date has been limited. Although many researchers andmanagers feel that native organisms are easier to use andpresent less risk to the environment this may not be true.Developing a successful management program with a nativeinsect is dependent on a number of critical factors that needto be considered. Information is needed on the feeding preferenceof the agent, agent effectiveness, environmental regulationof the agent, unique requirements of the agent,population maintenance of the agent, and time to desiredimpact. By understanding these factors, researchers andmanagers can develop a detailed protocol for using the nativebiological control agent for a specific target plant.. We foundE. leconteiin 14 waterbodies,most of which were in eastern Washington. Only one lakewith weevils was located in western Washington. Weevils wereassociated with both Eurasian (Myriophyllum spicatumL.) andnorthern watermilfoil (M. sibiricumK.). Waterbodies withE.leconteihad significantly higher (P< 0.05) pH (8.7±0.2)(mean±2SE), specific conductance (0.3±0.08 mS cm-1) andtotal alkalinity (132.4±30.8 mg CaCO3L-1). We also foundthat weevil presence was related to surface water temperatureand waterbody location ( = 24.3,P≤0.001) and of allthe models tested, this model provided the best fit (Hosmer-Lemeshow goodness-of-fit = 4.0,P= 0.9). Our results suggestthat in Washington StateE. leconteioccurs primarily ineastern Washington in waterbodies with pH≥8.2 and specificconductance≥0.2 mS cm-1. Furthermore, weevil distributionappears to be correlated with waterbody location (easternversus western Washington) and surface water temperature.
2000-01-01T00:00:00ZA decline of Eurasian watermilfoil in Minnesota associated with the milfoil weevil, Euhrychiopsis lecontei
http://hdl.handle.net/1834/19687
A decline of Eurasian watermilfoil in Minnesota associated with the milfoil weevil, Euhrychiopsis lecontei
Newman, Raymond M.; Biesboer, David D.
Euhrychiopsis leconteiRAYMOND M. NEWMAN1AND DAVID D. BIESBOER2ABSTRACTThe native milfoil weevil,Euhrychiopsis leconteiDietz, is acandidate biological control agent for the exotic Eurasianwatermilfoil (Myriophyllum spicatumL.) in northern NorthAmerica. Declines of Eurasian watermilfoil populations havebeen associated with the weevil but many of these examplesare poorly documented. We report the first documented declineof Eurasian watermilfoil in Minnesota due to the milfoilweevil.
2000-01-01T00:00:00Z