Invasive Species

Event

Climate Stewards Course with American River Conservancy

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

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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An adult emerald ash borer beetle on a leaf damaged by its feeding.
Article

Emerald Ash Borer Awareness Week 2025

May 15th, 2025
By Lindsey Hack
Tiny but destructive, the emerald ash borer (EAB) is an invasive beetle that has killed millions of ash trees across North America. In some cases, infested regions have lost nearly 100% of their ash trees to this pest. Though EAB has not yet been found in California, it was detected on the West Coast for the…
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Tree-of-heaven growing over a sidewealk in a neighborhood.
Article

Invasive Pest Spotlight: Tree-of-Heaven

May 7th, 2025
By Cherie Shook
Tree-of-heaven, Ailanthus altissima, was originally from China and became a popular landscape shade tree in the 1800’s. However, its rapid growth, aggressive spread, and native habitat disruption have made it a global problem. Reproducing rapidly through dense root suckers and wind dispersal of its “winged”…
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A smiling UC Master Gardener volunteer in an orange hat and green apron stands with arms raised in a garden setting, surrounded by people and plants.
Article

Top 5 Ways Gardeners Can Help Stop Invasive Species

April 25th, 2025
By Lauren L Snowden
Did you know that your backyard, balcony, or community plot is more than just a space for flowers and veggies? It's also a frontline defense against invasive species! As gardeners, we’re uniquely positioned to protect local ecosystems, and the good news is—it doesn’t take a lot to make a big difference.Here…
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Bermuda buttercup infesting a bed of landscaped plants.
Article

Spring is in the Air, and Oxalis is Everywhere

April 17th, 2025
By Lindsey Hack
Bermuda buttercup (Oxalis pes-caprae), also called buttercup oxalis or sourgrass, might be a familiar sight in winter and spring, particularly to those who live in coastal regions or the Sacramento Valley. Some people enjoy seeing this plant’s cheerful yellow flowers pop up in their spring gardens, but for…
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Detector dog stands on a small box, gazing at handler to alert a find
Article

Dogs Sniff Out Pest Problems

March 27th, 2025
By Lindsey Hack
Dogs use their keen sense of smell to help humans every day. Their powerful noses alert us to danger, aid in search and rescue operations, and even have the potential to diagnose diseases. But did you know that some dogs have been trained to sniff out harmful invasive pests? Enter the detector dogs! …
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Valley oak tree atop a hill of brown grass.
Article

Webinar: Mediterranean Oak Borer and Other Oak Pests

March 26th, 2025
By Lauren Fordyce
Join UC IPM for a free webinar on the invasive Mediterranean Oak Borer (MOB) and other important oak tree pests on April 10, 2025 from 6:00pm to 7:30pm. The Mediterranean Oak Borer (MOB) is an invasive ambrosia beetle that infests several species of white oaks in California: valley oak, blue oak,…
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Banner weeds
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Weeds & Invasive Plants

Lambert Yuri, Unsplash > Types of weeds > Life cycle of weeds > How to identify weeds > Managing weeds > What to do when you already have weeds > What you should know about weedkillers > How to prevent weeds Weeds are generally defined as any plant growing in a place where you dont want it, or a pla...
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