Invasive Species

California is famous for its scenic wilderness and biological diversity. Unfortunately, our state’s unique ecosystems are in danger, and invasive species are among the biggest threats to our environment. Invasive species can cause all kinds of environmental damage, such as harming wildlife, disrupting our…

This week (February 23-27, 2026) is National Invasive Species Awareness Week (NISAW), an event dedicated to raising awareness about invasive species, the threats they pose, and how we can slow their spread. When it comes to invasive species, your actions can have a big impact! What Can You Do? Take…

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…

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…

California is famous for its scenic wilderness and biological diversity. Unfortunately, our state’s unique ecosystems are in danger, and invasive species are among the biggest threats to our environment. Invasive species can cause all kinds of environmental damage, such as harming wildlife, disrupting our…

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…

 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,…

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,…

Invasive species are reshaping California’s natural and urban landscapes. UC IPM’s new Invasive Species Mini-Series explores the many ways invasive species impact our lives, from harmful garden pests and aquatic hitchhikers to destructive tree pests, invasive weeds, and the policies that guide prevention and…