2021 Cal-IPC Symposium Video Recordings

The 30-Year Anniversary 2021 Cal-IPC Symposium was our largest yet! More than 770 participants from California and beyond gathered to share the latest in invasive plant management and research. The online format gave us the opportunity to record and share these presentations for future viewing.

Each video features a full session or discussion/workshop, with minor editing to remove mic checks or technical glitches. Lightning Talks are at the bottom of the page. View the posters and PowerPoint presentations in PDF format on the 2021 Cal-IPC Symposium page in our archive.


Overview: 30 Years of Cal-IPC and Weed Management, and Session 1: Expanding the Community in Conservation

(0:20) Welcome and Overview: 30 Years of Cal-IPC and Weed Management

(23:45) Session 1, Intro – Moderator, Josie Bennett, Cal-IPC JEDI Committee Chair

(26:20) Why Justice, Equity, and Belonging Matter in Environmental Restoration Work – Shelana deSilva Policy and Advocacy Strategist, SdS Consulting

(41:02) Integrating JEDI Principles into Conservation – Amy Lethbridge Chief of Staff, Mountains Recreation and Conservation Authority, Community Nature Connection, National Association for Interpretation

(59:30) Panel Discussion


Workshop on the What & Why of Diversity, Equity, Inclusion, and Justice (DEIJ)

We define basic terms like justice, equity, diversity, inclusion, and cultural competency, and then lay out all of the reasons why this work is important to organizations, agencies, foundations, and institutions operating in plant conservation. This webinar will help you articulate what you mean when you are talking about JEDI and why it is important to your organization’s mission.
Led by the Avarna Group.


Workshop on the History of Conservation and Social Justice

We juxtapose better known conservation history with social history to draw connections between the history of land conservation and the continued marginalization and exclusion of Black, Indigenous, and people of color. In particular, we examine concepts of settler colonialism and how other conservation organizations have engaged in the concept of “decolonization.”

Led by Aparna Rajagopal-Durbin, Avarna Group

Workshop on Integrating TEK and Working with Tribal Partners

What does it mean to incorporate Tribal (or Traditional) Ecological Knowledge in our stewardship efforts? Following our plenary session, this discussion is an opportunity to learn more about working with Tribal partners and understanding our shared relationship to the land.

Moderated by Fernando Villalba, Regional Youth and Volunteer Programs Manager, National Park Service and Alys Arenas, Restoration Manager, Newport Bay Conservancy


  • Lazaro Arvizu, Naturalist, Gabrielino-Tongva Tribe
  • Koiya Tuttle, Pollution Prevention Division Manager, The Yurok Tribe
  • Tiana Williams-Claussen, Wildlife Department Director, The Yurok Tribe


Workshop on JEDI in Practice in Conservation Organizations

What does it look like to incorporate principles of Justice, Equity, Diversity, and Inclusion in a conservation organization? For every organization, it will look a little different, but there is much to be learned from colleagues at different stages in the journey.

Moderated by Josie Bennett, Laguna Canyon Foundation and Chair of the Cal-IPC JEDI Committee


  • Kim Bick, President of the Board of Directors, Newport Bay Conservancy
  • Jen Greene, Golden Gate National Parks Conservancy
  • Susan Jarratt, Board Member and Naturalist, Newport Bay Conservancy
  • Yakuta Poonawalla, Community Programs Manager, Golden Gate National Parks Conservancy

Career Panel

Moderated by Clarissa Rodriguez, Cal-IPC Student Liaison and PhD Student at UC Riverside

Designed for students and early-career professionals. Hear advice and input from people in different areas of the conservation field.


  • Harry Sandoval Natural Resources Manager, Riverside County Habitat Conservation Agency
  • Joey Algiers Restoration Ecologist, National Park Service
  • Shelley Pneh Ecologist, Grassroots Ecology
  • Marcos Trinidad Center Director, Audubon Center at Debs Park
  • Elise Gornish Extension Specialist-Ecology, management, and restoration of rangelands, University of Arizona


Herbicide Laws and Regulations

Recorded session from Oct. 26, 2021, at the California Invasive Plant Council 30-Year Anniversary Symposium

Moderated by Scott Oneto, UC Cooperative Extension

(1:50) Understanding Herbicide Labels and Drones Better – Beau Miller, Corteva

(27:31) Common Errors in Applying Herbicides – LeeAnne Mila, Deputy Agricultural Commissioner, El Dorado County Department of Agriculture

(57:38) Drone Regulations and Safety – Brandon Stark, Director, Center of Excellence on Unmanned Aircraft System Safety, University of California

(1:28:04) PRESCRIBE: An Online Database for Protection of Endangered Species from Pesticides – Catherine Bilheimer, Environmental Scientist, California Department of Pesticide Regulation

Session 2: Big Problems and Big Solutions in Invasive Plant Management

Moderator: Jason Giessow, Dendra Inc.

(1:28) Leveraging Partnerships to Advance Giant Reed (Arundo donax) Removal and Restoration in the Santa Clara River – Adam Lambert, Associate Researcher, UC Santa Barbara

(20:08) Investigating Drivers of Plant Abundance and Community Structure on Fuel Breaks – Robert Fitch, PhD Student, University of California, Santa Barbara

(40:08) Controlling an Early Detection of Caulerpa prolifera in Newport Bay – Brian Owens, Marine Biologist, California Department of Fish and Wildlife

Session 3: Early Detection Rapid Response

Moderator: Gina Darin, Senior Environmental Scientist, California Department of Water Resources

(1:23) Raising Awareness and Building Capability to Manage Early Invader Weeds in Victoria, Australia – Kate Blood, Program Manager – Weed Management, Department of Environment, Land, Water and Planning, Victoria, Australia

(21:21) Cycles of EDRR on Mt Tamalpais – Rachel Kesel, Conservation Management Specialist, OneTam and Golden Gate National Parks Conservancy

(40:00) Devil to Pay: Detection and Ten Years of Management of Chromolaena odorata (Devil Weed) in Hawai‘i – Jane Reppun Beachy, Natural Resources Conservation Manager, Army Natural Resources Program on O’ahu & University of Hawai’i

(1:02:35) Building Continuity Across State Plant Lists: Predicting Invasion Risk of Horticultural Plants – Alex Stubblefield, Program Manager, PlantRight

(1:23:04) Weed Alerts and Invasive Plant Updates for 2021 – Jutta Burger, Science Program Director, Cal-IPC and Robert Price, CDFA Seed Lab


Session 4: Global Biodiversity and Weed Management

Moderator: Metha Klock, Assistant Professor, San Jose State University. Note: Due to international connectivity issues, some section of dead air have been cut out of Anibal Pauchard’s talk, resulting in “jump cuts.”

(2:27) Plant Invasions and their Management in Africa – Arne Witt, Regional IAS Coordinator (Africa, Asia and Caribbean), CABI

(26:40) Protecting Wild Spaces through Invasive Species Management: A Case Study from British Columbia – Jodi Romyn, Director, Finance and Operations, Invasive Species Council of BC

(53:35) Chile and California: What can we learn from comparing plant invasions across regions and hemispheres? – Anibal Pauchard, Professor, Universidad de Concepción
(1:14:15) Direct Versus Indirect Effects of Invasive Grasses on Native Plant Diversity – Elizabeth Wandrag, Lecturer in Global Change Biology, University of York

(1:31:48) How Soil Microbes Drive and Respond to Plant Invasions in Mediterranean Ecosystems: Insights From Australian Acacias – Jaco Le Roux, Associate Professor, Department of Biological Sciences, Macquarie University, Sydney, Australia

(1:49:15) Panel Discussion


Session 5: New Mapping Tools

Moderated by Drew Kerr, Treatment Program Manager, Invasive Spartina Project

(2:15) Batman on a budget: Affordable Gadgets and Gear for Collecting Field Data – Brooke Mahnken, Operations/GIS Specialist, Maui Invasive Species Committee

(24:08) Drone Imagery and a Simple Spatial Analysis Technique for Long-term Mapping of Stinknet (Oncosiphon pilulifer) – Emily Burson, San Diego Zoo Wildlife Alliance

(40:00) Community Scientists Help to Map Post-Fire Recovery on California’s Central Coast – Josie Lesage, Applied Ecologist, Santa Barbara Botanic Garden

Session 6: Using Drones for Mapping and Control

Moderated by Scott Oneto, Advisor, University of California Cooperative Extension

(1:00) Making UAVs Part of Your Research Toolkit: Some Common Workflows for Vegetation Mapping – Maggi Kelly, Professor and Cooperative Extension Specialist, UC Berkeley, UC ANR

(20:58) Building the Data Pipeline for Managing Drone Layers – Greg Crutsinger, Customer Success Manager – Agriculture, Planet

(41:30) The Use of Drones for Mapping and Treating the Invasive Weed Phragmites in a Wisconsin Wildlife Preserve – Troy Gibbs, Application Services Contractor, T&T Endeavors LLC, Rantizo


Session 7: Invasive Plants and Native Plant Conservation in California 

Moderated by Aaron Sims, Rare Plant Program Director, California Native Plant Society

(3:03) Restoring Gaviota Tarplant in a Sea of Ice Plant: Challenges and Opportunities – Laura Riege, Restoration Manager, The Nature Conservancy

(22:33) Post-Fire Surveys for Rare Plants and Invasives in the San Bernardino Mountains – Naomi Fraga, Director of Conservation Programs, California Botanic Garden

(43:29) Utilizing Pathways of Invader Dominance to Identify Natives of Concern – Marina LaForgia, Postdoctoral Fellow, UC Davis & University of Oregon


Session 8: Invasive Plant Management in California’s 30×30 Initiative 

(5:28) California’s 30×30 Initiative – Christina Sloop, CA Dept of Fish and Wildlife

(24:55) Implications of Climate Change for Invasive Species – Carrie Brown-Lima, Director, New York Invasive Species Research Institute, Cornell University

(46:34) All Things to All People: Opportunities to Deliver on the Promise of 30×30 and “Nature-Based Solutions” – Andrea Williams, California Native Plant Society

(1:04:28) Tracking Metrics: Lessons from the Conservation Lands Network – Tom Robinson, Conservation Lands Network Lead, TOGETHER Bay Area

(1:24:17) Conserving a Global Biodiversity Hotspot: Aligning 30×30 Goals at the State and Global Scale – Dick Cameron, Director of Science, The Nature Conservancy, California

(1:40:22) Panel Discussion


Golden Weed Wrench “Ken Moore Award” and Session 9: Restoration and Invasive Plants

Moderator: James Mizoguchi, Biologist, Triangle Properties (organized by SERCAL)

(3:55) Ken Moore In Memorium Video

(12:21) Golden Weed Wrench “Ken Moore” Award Presented – Henry DiRocco, Laguna Canyon Foundation

(15:24) Herbicide Symptomology Refresher for Restoration Practitioners – Brad Hanson, Cooperative Extension Weed Specialist, UC Davis

(35:54) Plant-Soil Feedbacks: the Benefit of Field-Based Community Level Study in Uncovering Their Role in Restoration – Sarah Gaffney, Graduate Student Researcher, UC Davis

(51:02) Using Plastic Tree Shelters and Mechanical Weeding to Improve Post-Fire Restoration of Highly Invaded Plant Communities – Mark Mazhnyy, Masters Student, Cal Poly Pomona


Session 10: Lessons Learned in Managing Invasive Plants

Moderator: Jutta Burger, Cal-IPC

(0:43) Giant reed (Arundo donax) Control on the San Luis Rey River Watershed from 2000 to 2021- Persistence, Perspective and Patience (Transformation, but Still on the Wheel) – Jason Giessow, Principal Ecologist, DENDRA Inc.

(18:37) Lessons Learned after a Decade of Managing and Monitoring Stinknet (Oncosiphon pilulifer) across Southern California – Chris McDonald, Advisor, University of California Cooperative Extension

(37:33) Challenges Managing the Novel Large-Scale Invasion of Stinknet (Oncosiphon pilulifer) Post-Fire on the Santa Rosa Plateau Ecological Reserve – Hailey Laskey, Preserve Manager, Center for Natural Lands Management
(56:47) Closing Remarks – Doug Johnson, Executive Director, Cal-IPC


Discussion – Managing Grasslands (organized by CNGA)

Chaired by JP Marie, UC Davis


  • Christopher Rose, Solano Resource Conservation District
  • Ling He, Rangeland Management Specialist, Natural Resources Conservation Service
  • Zachary Principe, Project Manager, The Nature Conservancy


Discussion – When the Smoke Clears: Controlling Weeds After Wildfire

Chaired by Joey Algiers, Restoration Ecologist, National Park Service


  • Devyn Friedfel, Assistant Preserve Manager, Pepperwood Preserve
  • Garrett Dickman, National Park Service
  • Dave Erickson, Wildland Resource Planner, Orange County Fire Authority
  • Allison Sanger, Forest Botanist, Lassen National Forest

Discussion – Grant Funding, Grantsmanship, and Building Successful Funding Partnerships

Panel members from public agencies and partnering groups will provide information about grant opportunities, what they look for in successful grants, and how partnerships can be developed and utilized to improve the success of the grant and overall project.

Chaired by Cheryl Wilen, Retired CE Advisor, UCCE

(Note: The first 10 minutes of the session were not recorded, so the session jumps in mid-sentence. Also note that sound and video may be uneven due to connectivity issues.)


  • Matthew Baur, Director, Western IPM Center
  • Tory Vizenor, Senior Environmental Scientist, California Department of Pesticide Regulation
  • Jordan Weibel, Research Grants Program Lead, California Department of Pesticide Regulation
  • Karen Buhr, Executive Director, California Association of Resource Conservation Districts
  • Steven Addison, CIVICORPS


Lightning Talks

Calflora History Stacks: Tracking How Plant Populations Change Over Time – Cynthia Powell, Executive Director, Calflora


Early Detection Rapid Response Invasive Plant Removal Project Targeting Knotweeds, Arundo, and Shiny Geranium on the Far North Coast of California – Susannah Ferson, Director, Natural Resource Division, Redwood Community Action Agency and Carla Avila, RCAA


Identifying Native Plants that Promote Riparian Insect Community Recovery After Giant Reed (Arundo donax) Removal – Charlie Braman, University of California, Santa Barbara


Pollinator Response to the Removal of Giant Reed (Arundo donax) and Restoration Strategies in a Southern California Riparian System – Evan Hobson, Staff Research Associate II, UC Santa Barbara


Case Study: The Mystery of Perennial Pepperweed and Chlorsulfuron in Sierra Valley – Thomas Getts, Advisor, UCCE


Managing to Promote Biodiversity Across Property Lines in California Central Coast – Jenna Allred, Natural Lands Manager, Santa Lucia Conservancy


Assessing Chemical Management for the Control of Stinknet (Oncosiphon pilulifer) – Clarissa Rodriguez, Student, University of California Riverside


A Public Data Resource for Tracking Invasive Plants: the Consortium of California Herbaria’s CCH2 Portal – Katie Pearson, Data Manager, Arizona State University


Increasing the Diversity of People and Ecosystems Through Urban Restoration Projects – Joanna Tang, Doctoral student, University of California, Santa Barbara


Ailanthus Control Methods – William Neill, business, Riparian Repairs


The Effects of Vicia villosa Invasion on Grassland Plant-Pollinator Interactions – Rebecca Nelson, UC Davis


Avian Responses to Riparian Restoration on the Santa Clara River – Sean Carey, Staff Research Associate, UCSB, Marine Science Institute