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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
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    Coyote Brush Control Study Proposal

    UC Cooperative Extension San Benito County is going to collaborate with San Jose State University to develop a CAL FIRE Forest Health Research grant proposal. We are interested in looking at...


    By Devii R. Rao
    Author - San Benito County Director and Area Livestock and Natural Resources Advisor
    By Gale Perez
    Posted by - Program Representative
  • Knotweed Symposium 2023
    Knotweed Symposium: science & management webinar :: March 1, 2023

    MARK YOUR CALENDAR   Knotweed Symposium science & management webinar Wednesday, March 1, 2023   The webinar is intended to share information on control of Japanese knotweed,...


    By Steven Swain
    Author - Environmental Horticulture Advisor
    By Gale Perez
    Posted by - Program Representative
  • UCCE Livestock & Range blog
    Rancher seminar :: Dec. 6, 2022 via Zoom

    MARK YOUR CALENDAR Please join the San Benito Weed Management for our 21st Annual Continuing Education Seminar for Ranchers. Date: Tuesday, December 6, 2022 Time: 8:00 AM to 1:00 PM Location:...


    By Devii R. Rao
    Author - San Benito County Director and Area Livestock and Natural Resources Advisor
    By Gale Perez
    Posted by - Program Representative
  • Figure 1. The herbicide, Loyant, was trialed on cattails in the Delta in 2022. We will continue these investigations next year.
    2022 Delta Rice Recap

    In 2022, I estimate rice acreage in the Delta, south of the Yolo Bypass, was at least 8,000 acres. Most Delta rice is grown in San Joaquin County, but there is some acreage in Sacramento County....


    By Michelle Leinfelder-Miles
    Author - Farm Advisor
    By Gale Perez
    Posted by - Program Representative
  • datura wrightii closeup
    2022 weeds in review

    This year, I received a variety of questions from livestock owners in the region. All of the weeds I mention here were of concern to owners managing smaller (less than 20 ac) properties in Fresno and...


    By Rebecca Ozeran
    Author - Livestock and Natural Resources Advisor
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

UC Weed Science Twitter