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Weed Science

The Weed Science program, based out of the University of California Cooperative Extension- Napa County office, holds a wealth of weed related information and is a must visit if you are looking to learn more about control tactics or identification. You can also find some important links below:

UC Weed Science Blog
  • Non-native grasses are invading vast swaths of southern California. Those grasses feed wildfire, including the recent York Fire in the Mojave Desert. Recent fires have torched more than a million of the iconic Joshua trees native to the region. (Ziarnek-Krzysztof/Wikimedia Commons)
    Wildfires linked to invasive grasses, Valliere says

    Auto emissions 'fertilize' fuel Joshua trees burning in the Mojave Desert are the victims of changing patterns of wildfire, fueled by the spread of grasses that are not native to the region,...

    By Trina Kleist
    Author - Communications Specialist
    By Gale Perez
    Posted by - Public Education Specialist
  • AAIE logo
    EVENT :: AAIE Conference

    Anil Shrestha (Weed Science Professor, with the Department of Plant Science at CA State University, Fresno) will be speaking at the Association of Applied IPM Ecologist (AAIE) Annual Conference in...

    By Gale Perez
    Posted by - Public Education Specialist
  • East Bay Regional Park District
    Job announcement :: Vegetation Ecologist (2)

    The East Bay Regional Park District is currently recruiting for two (2) Vegetation Ecologists and these positions will be headquartered at the Park District's Administrative Office, 2950 Peralta Oaks...

    By Gale Perez
    Posted by - Public Education Specialist
  • Ryan Hill: Weed Science and Agronomy Advisor
    New Advisor for Weed Science and Agronomy: Ryan Hill

    My name is Ryan Hill, and I am the new UC Cooperative Extension Weed Science and Agronomy Advisor in Tehama County, also serving Shasta and Glenn counties. I received a B.S. in Biology from George...

    By Ryan Hill
    Author - Agronomy & Weed Sciences Advisor
  • Doctoral student Tong Zhen is studying the effectiveness and soil impacts of this electrical weed control device, made by the Brazilian company Zasso, He’s working with Brad Hanson, professor of UC Cooperative Extension, both in the UC Davis Department of Plant Sciences. (Trina Kleist/UC Davis)
    Zap those pesky invaders: technology sparks alternative to herbicides

    A contraption with a long, low, green metal arm swept noisily along the edge of a row of almond trees in an experimental orchard just west of UC Davis. Little flashes of light sparked between the...

    By Trina Kleist
    Author - Communications Specialist
    By Gale Perez
    Posted by - Public Education Specialist
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Weed Resources
Photo of John A Roncoroni
John A Roncoroni
Title: Weed Science Farm Advisor, Emeritus
Specialty: Weed Control and Vegetation Management in Perennial Crops, Covercrops and Aquatic Weed Control
Address:
UC Cooperative Extension
1710 Soscol Avenue
Suite 4
Napa, CA 94559-1315
Phone: 707-253-4221
Email: jaroncoroni@ucanr.edu
Weed ID Tool

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UC Weed Science Twitter