Invasive Species

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dry grass on a sloping hillside caught in a blaze of fire
Urban & Community IPM Webinars: Event

Weeds, Wildlands, & Wildfires

Event Date
Nov 5, 2025

Join invasive plant expert Chris McDonald to learn about the impacts of invasive weeds and how they are managed in California.
Urban & Community IPM Webinars
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A dark brown beetle with six bright yellow spots on its back and bright yellow segments on its abdomen.
Urban & Community IPM Webinars: Event

The Growing Threat to Our Trees

Event Date
Oct 1, 2025

Join forestry expert Beatriz Nobua-Behrmann for an educational webinar exploring important invasive pests that impact California’s trees.
Urban & Community IPM Webinars
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Large white pipe covered with mud and mussels clustered from another center pipe.
Urban & Community IPM Webinars: Event

Protect California’s Waters from Invasive Species

Event Date
Sep 3, 2025

Learn about aquatic invasive species like golden mussels, nutria, and simple actions you can take to help protect our waters from these destructive pests.
Urban & Community IPM Webinars
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Green tomato plant leaves with white damage chewed spots and a brown moth standing atop one leaf.
Urban & Community IPM Webinars: Event

Invasive Pests In Your Edible Garden

Event Date
Aug 6, 2025

Discover steps you can take to protect your harvest and learn how you can help stop the spread of invasive species.
Urban & Community IPM Webinars
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UC Master Gardeners of El Dorado County: 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.
UC Master Gardeners of El Dorado County
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Yellow flowering shrub in a field.
Urban & Community IPM Webinars: 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 …
Urban & Community IPM Webinars
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Valley oak tree atop a hill of brown grass.
Urban & Community IPM Webinars: 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…
Urban & Community IPM Webinars
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Several large, brilliant purple flowers scattered over dense, deep green leaves.

When Ornamentals Escape

January 20, 2026
By Cherie Shook
You might be surprised to learn that a few of your favorite ornamental plants are invasive to California and can “escape” your yard causing big problems in the wild. When plants escape landscape and garden boundaries, it is often due to seed distribution or aggressive roots. An invasive plant species can…
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Many orange fruits and leaves photographed from above.

Don't Give Pests This Holiday Season

December 16, 2025
By Lindsey Hack
Winter is peak citrus season, and a time when many people gift their home-grown fruit to friends and loved ones. This holiday season, we would like to remind everyone that harmful invasive pests can move to new areas on citrus fruit. There are several active quarantines in California aimed at slowing the…
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