Pests And Weeds

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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Green alfalfa field with scattered blooms of purple flowers blowing in the wind.
Event

Webinar: Pest Management in Alfalfa, Small Grains, and Garbanzo Beans

Sep 24 2025

This webinar is part of the UC Ag Experts Talk series. Dr. Michelle Leinfelder-Miles, Delta Crops Resource Management Advisor with the University of California Cooperative Extension, San Joaquin County, will discuss the principles of Integrated Pest Management and pest management in alfalfa, small grains,…
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Oval-shaped insect with triangular marking on its back with membranous wings
Event

Webinar: Field Crop Insect and Weed Management Updates

Aug 6 2025

This webinar is part of the UC Ag Experts Talk series. Nicholas Clark, Associate Cooperative Extension Area Agronomic Cropping Systems and Nutrient Management Advisor, will give an introduction of agronomic cropping systems and their current weed and insect pest management challenges. He will describe…
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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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Bermuda buttercup infesting a bed of landscaped plants.
Article

Spring is in the Air, and Oxalis is Everywhere

April 17, 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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Central Sierra: Calendar

UC Central Sierra programming includes virtual and on-line training as well as in-person classes and workshops in Amador, Calaveras, El Dorado, and Tuolumne Counties.
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Invasive Plant Species

Invasive plants are one of the greatest threats to croplands, rangelands, aquatic areas, and wildlands in the United States; they degrade the productivity and biological diversity of all ecosystems. Below are the sixteen most harmful weeds in Humboldt County.
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Edible plants in raised beds at the Demonstration Garden.
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Ask Us

Got gardening questions? Find out about the variety of ways to contact us and get answers.
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Outdoor classroom and students at the Demonstration Garden.
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Workshops

UC Master Gardeners of Butte County offers workshops in a variety of topics during the spring and fall months.
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