Invasive Species

Event

Central Sierra: Starthistle (EDC MG)

Event Date
Nov 8 2025

Come learn about this invasive weed that has taken over large portions of California’s range land and urban landscape. Learn about its origins, how it moves, why it is so difficult to control, how to overcome these difficulties, control methods, and how to design an effective control program.
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Event

Climate Stewards Course with American River Conservancy

Event Date
Sep 17 2025 - Nov 19 2025

The UC Climate Stewards seeks to foster a committed corps of volunteers ready to effectively engage in transformative local solutions to promote community and ecosystem resilience in a changing climate. This ten week course will introduce you to social-emotional resilience and trauma-aware practices, climate…
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Yellow flowering shrub in a field.
Event

Webinar: Managing Invasive Plants

Event Date
Aug 21 2025

In California, invasive plants cause problems such as increasing wildfire risk, damaging ecosystems, and affecting recreation activities. Join us to learn about the impacts of invasive plants and ways you can help prevent the spread of invasive plants.About the Urban and Community IPM Webinar …
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Valley oak tree atop a hill of brown grass.
Event

Webinar: Mediterranean Oak Borer & Other Pests of California Oaks

Event Date
Apr 10 2025

The Mediterranean Oak Borer (MOB) is an invasive ambrosia beetle that infests several species of white oaks in California: valley oak, blue oak, and Oregon oak. The beetle is spreading rapidly in Napa, Lake, Sonoma, and Sacramento Counties and has been detected in neighboring El Dorado, Yolo, and Mendocino…
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Dotted paropsine leaf beetle adult and larvae on a leaf. Chris Shogren
Article

Dotted Paropsine Leaf Beetle Threatens California’s Eucalyptus

June 30, 2025
By Christopher J Shogren
The dotted paropsine leaf beetle (Paropsis atomaria), an invasive pest native to Australia, was first discovered in California in 2022 and is rapidly spreading throughout Southern California targeting eucalyptus trees. Both adult beetles and their larvae feed on eucalyptus leaves, causing significant…
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Tumbleweeds piled up against the front of a home.
Article

Tumbleweeds Invading?

June 23, 2025
By Belinda Messenger-Sikes
Tumbleweeds rolling across the landscape may make you think of classic old Western movies, but tumbleweeds, or Russian thistle, is more common today than you might think. This invasive plant can grow anywhere the soil is disturbed and once it matures, it breaks off its stem and the dried plant blows across…
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A shiny green and bronze beetle on a heavily damaged leaf.
Article

Wrapping Up Invasive Species Action Week

June 12, 2025
By Cherie Shook, Lindsey Hack
This week, we shared information about important invasive species, what to do if you find them, and how you can help prevent their spread. To wrap up California Invasive Species Action Week, we’d like to highlight a few key takeaways: Don’t pack or plant a pest Whether you’re traveling or gardening…
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Tall, green stalks of giant reed towering over two humans standing in front.
Article

Keep Invasive Plants Out!

June 11, 2025
By Lindsey Hack
The golden flowers of French broom covering hillsides and the tall, striking stalks of pampasgrass stand out on trails and roadsides. These plants may be beautiful, but they are invasive and harm California’s natural landscapes.  Invasive plants outcompete and crowd out native plants, damaging…
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A staff person from the California Department of Fish and Wildlife inspects a boat.
Article

Clean, Drain, Dry: Protect Our Waters

June 10, 2025
By Cherie Shook
You may not see them, but small hitchhikers can cling to your boats, trailers, fishing gear, kayaks, and paddleboards. These hitchhikers are aquatic invasive species like plants, fish, and mussels. Once introduced to a body of water, they can displace native species, clog motors, damage water delivery…
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