Invasive Species

dry grass on a sloping hillside caught in a blaze of fire
Event

Weeds, Wildlands, & Wildfires

Nov 5, 2025

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

The Growing Threat to Our Trees

Oct 1, 2025

Join forestry expert Beatriz Nobua-Behrmann for an educational webinar exploring important invasive pests that impact California’s trees.
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Event

Central Sierra: Starthistle (EDC MG)

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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Yellow flowering shrub in a field.
Event

Webinar: Managing Invasive Plants

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

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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A light green plant with many branching stems and bright yellow, spiky flowers.
Article

Managing Invasive Plants: Your Questions Answered!

September 22, 2025
UC IPM recently hosted a webinar about invasive plant management in California. During the presentation, our speakers Constance Taylor and Jutta Burger from the California Invasive Plant Council (Cal-IPC) answered live questions from attendees. Below are some of those questions and answers. If you…
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A bright red strawberry with a damaged, mushy section that has a tiny, white, worm-like maggot on it.
Article

Is That a Maggot in My Berry?

September 8, 2025
By Cherie Shook
 A little red-eyed fly is trending on social media for all the wrong reasons. Why? Because people are finding maggots in some of their berries! Sounds gross, but what is it?   This small fly, called spotted wing drosophila (SWD), love soft-skinned fruits such as cherries, blueberries,…
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Tree of Heaven
Article

Closing a Chapter, Celebrating Success: Tree-of-Heaven Scouting Project Wrap-Up

August 20, 2025
By Lauren L Snowden
We’re thrilled to celebrate the incredible success of the tree-of-heaven scouting portion of the Invasive Species Scout Project. Thanks to the passion, curiosity, and dedication of our UC Master Gardener volunteers, this community science initiative surpassed all expectations. Over the past year and a half,…
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