2023 Cal-IPC Symposium Video Recordings

Thank you for joining us at the 2023 Cal-IPC Symposium! Between virtual and in-person guests, more than 630 participants gathered to share the latest in invasive plant management and research in California.

Each video features a full session or workshop, with minor editing to remove “deadspace” at opening of sessions. Posters and PowerPoint presentations will be posted in PDF format on the 2023 Cal-IPC Symposium page in our archive.

Cal-IPC Update and Session 1: Trabajadores de la Tierra: Workforce
Development and Indigenous Knowledge

Moderated by Max Bell Alper, North Bay Jobs for Justice Alliance

(0:00) Welcome and Cal-IPC updates – Doug Johnson, Cal-IPC

(20:58) Session intro and background – Max Bell Alper, North Bay Jobs for Justice Alliance

(29:11) Indigenous migrant farmworkers and restoration: A win-win – Don McEnhill and Birkin Newell, Russian Riverkeeper, and Lucía López, Community organizer and farm worker (note that Lucía’s mic was broadcast into the meeting room, and did not pick up on video recording consistently)

(45:43) Crossboundary traditional knowledge and landscape management – José Luis Duce Aragüés, The Watershed Center

(59:06) Uplifting communities of color in land management – Marianna Zavala, North Bay Jobs for Justice Alliance

(01:08:00) Summary and Q&A

Session 2: Invasive Species Issues in Changing Landscapes

Moderated by Robert Fitch, UC Santa Barbara

Influence of a dam on one watershed scale weed control project – April Damanti, River Partners

Restoring coastal grassland on deeply scraped soils in Monterey County, CA – Andrea Woolfolk, Elkhorn Slough, NERR


Session 3: Managing New Weeds in California

Moderated by Guy Hernandez, National Park Service

(00:14) Managing garlic mustard within the Deep Creek Watershed on the San Bernardino National Forest – Joseph Esparza, US Forest Service

(15:03) North coast invasive weeds – early detection rapid response eradication project – Candace Reynolds and Susannah Ferson, Redwood Community Action Agency

(35:22) Drones as a tool for monitoring ribbonweed (Vallisneria australis), a recently detected non-native submersed aquatic plant in the Sacramento-San Joaquin Delta – Anthony Elias-Linarez, CA Dept. of Water Resources

Session 4: Rare Plants and Weeds

Moderated by Tom Reyes, California Native Plant Society

(0:00) Integrated pest management (IPM) to control invasive plant species in a California
vernal pool-grassland complex – Jasmine Rios, CSU Sacramento and CA Dept. of Fish
and Wildlife

(19:29) Prescribed fire for medusahead (Elymus caput-medusae) control and impacts to
species composition in an invaded California grassland – Jason M. Mills, WRA

(40:33) Estimating invasive plant risk to federally listed plant species in central coastal
California – Jutta Burger, Cal-IPC

Session 5: Lightning Talks

Moderated by Lauren Quon, Cleveland National Forest

Public gardens as sentinels against invasive plants – Michelle Beloskur, Midwest Invasive Plant Network

Join in California Invasive Species Action Week! – Elizabeth Brusati, CA Dept. of Fish and Wildlife

Calling for a consortium on a rosette weevil against yellow starthistle in California – Ikju Park, Dept. of Entomology, UC Riverside

Manipulation of release conditions improve establishment of the wasp Tetremesa romana for biological control of Arundo in northern California– Patrick J. Moran, US Dept. of Ag. – Ag. Research Service

The effect of yellow starthistle invasion on native plants and pollinators – Rebecca Nelson, UC Davis

Remote-operated robotic mower use along roadsides – Stephanie Ponce, CalTrans

Effects of mowing at varying propagule pressures on competition between native and nonnative annual species – Brittney Sheets, CalPoly Pomona

Effective cheatgrass control with fluazifop-p-butyl in the Coast Range, Marin County – David Greenberger, Golden Gate Nat. Parks Conservancy

Techniques to eradicate invasive giant reed from Trabuco Creek, Orange County – Robert Freese and Collin Raff, Irvine Ranch Conservancy

Slaying the dragon: How Irvine Ranch Conservancy volunteers achieved management success in significantly reducing Sahara mustard (Brassica tournefortii) on a site in Orange County, California – David Wilson, Irvine Ranch Conservancy

Session 6: Weed Management in Aquatic, Wetland, and Riparian Habitats

Moderated by Michael Kwong, California Department of Water Resources

Ecosystem engineering impacts of water primrose (Ludwigia spp.) in the Delta – Bailey Morrison, UC Merced

Propagule pressure of invasive common reed (Phragmites australis) in Suisun Marsh: Seedset, germination success, and seedling susceptibility to herbicide – Virginia Matzek, Santa Clara Univ.

Biology and ecology of yellow flag iris: Research updates to support integrated weed management – Brenda J. Grewell, US Dept. of Ag. – Ag. Research Service


Session 7: Weed Management in Grasslands

Moderated by Justin Luong, CalPoly Humboldt. Presented in collaboration with the California Native Grasslands Association

Replacing annual grasses with native vegetation to reduce wildfire risk of fuel breaks and roadsides – Robert Fitch, UC Santa Barbara

Rapid evolution of native and invasive California grassland species to altered water availability – Katherine Brafford, UC Davis

A mosaic approach to forb-and grassland restoration in a heterogenous landscape – Paul Aigner, UC Davis McLaughlin Reserve


Session 8: The Intersection of Art and Science in Managing Weeds

Moderated by Rebecca Nelson, UC Davis, and Constance Taylor, Cal-IPC

Art, science, and collections – Zoe Wood, UC David

Know the land, save the land program: Science communication through place-based apparel design – Melissa Hamilton and Lori Wahl, Univ. of Idaho Extension

Care for us: Aesthetics and social practice in land management – Jess Rath, Block Stewards for Native Parkways


Session 9. Habitat Restoration and Invasive Plant Management

Moderated by Katy Chappaz, RECON Environmental. Presented in collaboration with SERCAL.

Big Canyon Coastal Habitat Restoration and Resiliency Project, Phase 3: CEQA exempt through
CDFW’s SERP process – Alys Arenas, Newport Bay Conservancy

Adaptive management at Dos Rios Ranch and Willow Bend Preserves: The effect of seeding timing and irrigation methods on understory establishment and weed control in floodplain restoration – Sarah Gaffney, River Partners

Farm edge restoration monitoring in Sacramento Valley highlights native bee use of some exotic plant floral resources – Corey Shake, Point Blue Conservation Science


Session 10. Fighting Fire and Weeds Together (plus Weed Alerts)

Moderated by Steve Buckley, National Park Service. Presented in collaboration with National Park Service.

Wildfire resilience in the Santa Monica Mountains: A collaborative approach – Danielle LeFer, CA State Parks, Angeles District

Challenges in managing roadside vegetation to prevent fire and weed spread – Ken
Gallo and Lisa Worthington, Caltrans

Minimizing weed spread during fire suppression: Weed wash stations and wildfire – Joanna Clines, Sierra Nat. Forest

Weed Alerts – Jutta Burger, Cal-IPC and Ron Vanderhoff, CA Native Plant Society –
Orange County Chapter


Session 11. Soils and Invasive Plants

Moderated by Amanda Swanson, CA Dept. of Fish and Wildlife

Aridity constrains the adaptive potential of plant invaders under nitrogen deposition – Justin Valliere, UC Davis

Response of Mojave Desert-native perennials to inoculum from invasive and native annuals – Mayra J. Hernández, UC Davis

Biogeographical patterns of the rhizosphere microbiome of a native and invasive grass in the western United States – Rebecca Mueller, US Dept. of Ag. – Ag. Research Service


Session 12: Weeds vs. Natives: Which Does Our Wildlife Prefer in Natural Areas?

Moderated by Tanya Meyer, Yolo County RCD

Evaluating the plasticity of a “specialized” rodent in a highly invaded estuary – Katie Smith, WRA, Inc. and UC Davis

Long-term outcomes of active reforestation versus natural regeneration following invasive salt cedar removal on the lower Colorado River – Emma Havstad, River Partners

Cheatgrass in the sagebrush: Implications of habitat loss and conversion on sagebrush-dependent species, using the Greater Sage-Grouse and Mule Deer as indicator species – Katie Andrle, Nevada Dept. of Wildlife


Session 13. Biological Control of Invasive Plants

Moderated by Patrick Moran, US Dept. of Ag. – Ag. Research Service

Biocontrol research on invasive annual grasses – Brian Rector, US Dept. of Ag. – Ag. Research Service

Biological control agents of weeds in California: Overview of rearing, releases, and monitoring by the CDFA Biological Control Program – Chris Borkent, CA Dept. of Food and Ag.

Biological control of aquatic weeds in California: Status update and a look to the future – Paul Pratt, US Dept. of Ag. – Ag. Research Service


Session 14. Adaptive Management and Lessons Learned

Moderated by Stephanie Ponce, Caltrans

Using 10 years of applicator data to assess species status and feasibility of objectives in a long-term eradication program – Lisa R. Ordonez, US Navy

Gorse (Ulex europaeus) eradication in a coastal park unit– Taylor Groves, CA State Parks

Benefits of Indigenous-led collaborative stewardship practices on oblong spurge populations – Tanya Chapple, Mid Klamath Watershed Council


Session 15. Landscape Scale Collaboration on Invasive Plant Management

Moderated by Doug Johnson, Cal-IPC

Regional partnership to steward San Francisco Bay wetlands – Drew Kerr, Invasive Spartina Project

Managing invasive annual grasses through the Sage Grouse Initiative – Thad Heater, Natural Resources Cons. Service

Cutting green tape with the California Department of Fish and Wildlife – Brad
Henderson, CA Dept. of Fish and Wildlife


Workshop: What to do when you’re expecting (a fire)

Presenting in collaboration with National Park Service. Instructor: Steve Buckley, National Park Service.

Herbicide Laws and Regulations

Moderated by LeeAnne Mila, El Dorado County Agricultural Commissioner

What is needed to be a certified applicator?Jasmin Bonilla, UC Ag. and Natural Resources

Noxious weeds laws and regulations – LeeAnne Mila, El Dorado County Ag. Comm.

Strategies to avoid non-target herbicide impacts – Krista Hoffman, CA Dept. of Fish and

Sustainable Pest Management roadmap – Kimberly Crispin, Dept. of Pesticide Regulations