INTERNATIONAL KNAPWEED SYMPOSIUM
8:00 Registration Thursday March 15, 2000
9:15 – 12:00 General Session
9:15 Welcome and introduction – Linda M. Wilson, Symposium Chair
9:30 Knapweed management: another decade of change – Celestine Duncan
10:00 Ecological principles for managing knapweed – Roger Sheley
10:30 Knapweed eradication program in Alberta – Shaffeek Ali
11:00 Biological control of Russian knapweed: state of the art – Urs Schaffner, J. Lars Baker, David J. Kazmer, Paul E. Parker, Robert D. Richard and M. Wille
11:20 Integrated approaches for the management of yellow starthistle – Joseph M. DiTomaso and Steven F. Enloe
12:00 – 1:00 Lunch
1:00 – 2:30 Concurrent sessions
| Section A Spotted knapweed – revegetation | Section B Yellow starthistle |
| 1:00 Establishing desirable grass in spotted knapweed
infestations using high seeding rates – James S. Jacobs and Roger L. Sheley |
1:00 Comparison of North American and Eurasian yellow starthistle populations using AFLP fragment pattern analysis – Douglas G. Luster, William L. Bruckart, Michael Pitcairn and Massimo Cristafaro |
| 1:15 Developing single entry revegetation of spotted knapweed-infested rangeland – Monica L. Pokorny, Roger L. Sheley, James S. Jacobs and Daniel E. Lucas | 1:15 A landscape strategy for the management and control of yellow starthistle in the Salmon River Canyon – Leonard Lake and Carl Crabtree |
| 1:30 Native bunchgrass community restoration using knapweed herbicides – Peter M. Rice | 1:30 Clientele behavioral changes necessary for effective yellow starthistle management strategies – Carl Crabtree |
| 1:45 Nitrate uptake of spotted knapweed and two native grasses from pulse events – Bret E. Olson and Pamela S. Blicker | 1:45 Examination of a toxin produced by Alternaria spp. on yellow starthistle – Timothy L. Widmer, Fatiha Guermache and Karine Vidal |
| 2:00 Influence of nutrient availability on the interaction between spotted knapweed and native perennials – Jane Krueger, Roger Sheley and Gretchen Herron | 2:00 Biological control of yellow starthistle in the Western U.S.: four decades of progress – Gary L. Piper (30 minutes) |
| 2:15 Effects of season and frequency of mowing on spotted knapweed and grasses – Matthew J. Rinella, James S. Jacobs and Roger Sheley |
2:30 – 3:30 BREAK and POSTER SESSION
3:30 – 5:00 Concurrent sessions
| Section A Spotted knapweed – biological control and taxonomy | Section B Yellow starthistle and grazing |
| 3:30 Status of biological control efforts against spotted and diffuse knapweed – Jim M. Story and Gary L. Piper | 3:30 Ability of annual and perennial grass communities to withstand invasion by yellow starthistle – Timothy S. Prather and Linda M. Wilson |
| 3:45 How to select optimal sites for establishment of Agapeta zoegana and Cyphocleonus achates, two root feeding insects of knapweed – Nancy J. Sturdevant and Sandy J. Kegley | 3:45 A novel genetic approach to the control of noxious weed populations: the Seed Arrest System (SAS) for control of yellow starthistle, in western US rangelands – Melvin J. Oliver and Nabil S. Atalla |
| 4:00 Direct and indirect effects of well-behaved biological control agents on nontarget species – a case study: spotted knapweed, gall flies and deer mice – Dean E. Pearson, Yvette K. Ortega, Kevin S. McKelvey and Leonard F. Ruggiero | 4:00 The complexities of grazing management following yellow starthistle control and wheatgrass establishment – Stephen F. Enloe, Joseph M. DiTomaso, Daniel J. Drake and Steve B. Orloff |
| 4:15 Knapweed, gall flies, and mice: unexpected interactions – Amanda G. Stanley | 4:15 A positive experience in weed management: an overview of the Tri-State Demonstration Weed Management Area – Lynn A. Danly |
| 4:30 Considerations for resuming foreign exploration for natural enemies of spotted knapweed – Lincoln Smith | 4:30 Seed germination of yellow starthistle and spotted knapweed after treatment with picloram or clopyralid – Vanelle F. Carrithers, Dean R. Gaiser, Celestine Duncan and Denise Horton |
| 4:45 Are biological controls effective against knapweed?: Neighboring plant determines compensatory response of spotted knapweed – Beth Newingham, Catherine A. Zabinski and Ragan M. Callaway | 4:45 Reproductive phenology in yellow starthistle – Cindy Roché |
5:30 No-Host Social Hour and Posters
6:30 Dinner, Speaker Bruce Barnes, Comprehensive interactive plant keys for the Northwest
Friday, March 16, 2001
8:00 – 9:15 Concurrent Sessions
| Section A Spotted knapweed – management, restoration, detection | Section B Other species and squarrose knapweed |
| 8:00 Sheep grazing of spotted knapweed – Bret E. Olson and Roseann T. Wallander | 8:00 Importance and distribution of Centaurea species in Turkey, Sibel Uygur |
| 8:15 Integrating 2,4-D and sheep grazing to manage spotted knapweed infested rangeland – Stephen M. Laufenberg, Roger L. Sheley and James S. Jacobs | 8:15 Squarrose knapweed: occurrence and natural history in rangelands of central Utah – Scott L. Jensen and Stephen B. Monson |
| 8:30 Prescription grazing for Centaurea control on rangelands Karen L. Launchbaugh and John R. Hendrickson | 8:30 From challenge to opportunity: squarrose knapweed Demonstration Weed Management Area – Pat Fosse |
| 8:45 Grassland restoration in the weed capital of the West:
changing Missoula attitudes – Kate Supplee |
8:45 Control of squarrose knapweed on burned and non-burned rangeland – Steven Dewey, William Mace and Pat Fosse |
| 9:00 Grassland restoration in the weed capital of the west: the importance of education and public involvement – Marilyn Marler | 9:00 Establishment of biological control agents on squarrose knapweed in California – Dale M. Woods and Viola Popescu |
9:15 – 10:00 Break and Poster Session
10:00 – 11:00 Concurrent sessions
| Section A Spotted and Diffuse knapweed | Section B Chemical control and Russian knapweed |
| 10:00 Detecting and mapping spotted knapweed in rangeland ecosystems using airborne digital imagery – Shana G. Driscoll, Roger L. Sheley and Rick L. Lawrence | 10:00 BASF product update for knapweed control – Joseph G. Vollmer and Jennifer L. Vollmer |
| 10:15 Mechanisms for the success of invaders: diffuse knapweed interacts differently with new neighbors than with old ones – Ragan M. Callaway and Erik T. Aschehoug | 10:15 Factors that make Russian knapweed a highly competitive plant – Rick M. Bottoms, Tom D. Whitson, C. Jerry Nelson and John H. Coutts |
| 10:30 Use of a Geographic Information System (GIS) for monitoring large-scale diffuse knapweed control efforts at the Rocky Flats Environmental Technology Site – Jody K. Nelson | 10:30 Precipitation effects on Russian knapweed dominance – Harold D. Fraleigh, K. George Beck and Debra P. Peters |
| 10:45 Sampling and modeling invasive plant infestations: techniques for identifying plant distribution in rangeland environments – Elizabeth A. Roberts, Roger L. Sheley, Rick L. Lawrence, and Richard Aspinall | 10:45 Fall applications of picloram for control of Russian knapweed prior to reseeding perennial cool-season grasses – Tom D. Whitson |
11:00 – 12:00 General Session
11:00 Where do we stand, and where are we going? Symposium synopsis/evaluation – Vanelle F. Carrithers
12:00 Symposium concluded
POSTERS
Integrated Management of Spotted and Diffuse Knapweed – Celestine Duncan, Melissa Brown, Vanelle F. Carrithers, Jim Sebastian and K. George Beck
Effects of the Interaction of the Biocontrol Agent, Agapeta zoegana L., and Grass Competition on Spotted Knapweed – Jim Story, Lincoln Smith, William Good and Linda White
Restoring Natural Areas with Successful Diffuse Knapweed Control – Berta Youtie
How to Monitor Spotted Knapweed Biological Control Root Feeding Insects: Agapeta zoegana and Cyphocleonus achates – Nancy J. Sturdevant and Sandy J. Kegley
Biology and Biological Control Agents of the Knapweeds, a Reference for Biological Control Programs – Carol Randall and Linda M. Wilson
Controlling Spotted Knapweed through Selective Defoliation at Varying Phenologic Stages – Dan Patten and John Hendrickson
Potential Forage Value of Spotted Knapweed – Matt B. Jones, Amy C. Ganguli, Karen L. Launchbaugh and Michael B. Hale
Developing Prescription Grazing Guidelines for Controlling Spotted Knapweed with Sheep – Michael B. Hale and Karen L. Launchbaugh
Effects of Defoliation on Reproduction of Yellow Starthistle – Stacy Platt, Michael L. McInnis, Larry L. Larson and Gary L. Kiemnec
Molecular Markers for Centaurea Population Genetics – Ruth A. Hufbauer, Shanna E. Carney, René Sforza and Lincoln Smith
Salmon River Non-Chemical Spotted Knapweed Control – Marla Knight, Peter Brucker and Cathy Leavens
On the Taxonomy of Spotted Knapweed (Centauea stoebe L.) – Jörg Ochsmann
An Overlooked Knapweed Hybrid in North America: Centaurea x psammogena GÁYER (diffuse knapweed x spotted knapweed) – Jörg Ochsmann
Dynamic State Variable Model of Optimal Clutch Size in Urophora affinis on Spotted Knapweed – Robert M. Nowierski, Zheng Zeng and Bryan C. FitzGerald
New Foreign Explorations for Classical Biocontrol of Spotted Knapweed- Rene Sforza, Jim Story, Ruth Hufbauer, Javid Kashefi and Paul C. Quimby
Chaetorellia succinea – Is This Unintentionally Released Yellow Starthistle Agent Safe?- Joe Balciunas and Baldo Villegas
Survival of the Root Mining Biological Control Agents Agapeta zoegana and Cyphocleonus achates in spotted knapweed Treated with Three Concentrations of the Herbicides Tordon and Transline -Dennis Vander Meer, Diana L. Six, Nancy Sturdevant
State-County Distribution of three Biological Control Agents on Yellow Starthistle in California - Baldo Villegas, Dale Woods, Mike Pitcairn, Don Joley and John Gendron
Potential Host Range of two Urophora Flies and an Eriophyid Mite for the Biological Control of Russian Knapweed - Jeff L. Littlefield, Ann E. de Meij and Rouhollah Sobhian