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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
  • 2021 Rice Growers Meeting UPDATED Announcement
    ANNOUNCEMENT :: 2021 Rice Growers Meeting

    Mark your calendar...   UC COOPERATIVE EXTENSION presents 2021 Rice Growers Meeting  When: February 11, 2021|9:00 AM-12:00 PM Where: Virtual via Zoom Cost: $10 Click here to...

    By Gale Perez
    Posted by - Program Representative
  • Large boom sprayers are used to efficiently apply herbicides over agricultural fields. Visual: Will Fuller / Flickr
    Will rising temperatures make superweeds even stronger?

    Will Rising Temperatures Make Superweeds Even Stronger? Widely used herbicides are struggling to kill some weeds. Some experts think heat could be part of the problem. From the digital magazine,...

    By Gale Perez
    Posted by - Program Representative
  • Palmer vs waterhemp
    Summer scholars opportunity at Cornell University

    Weed Science-Based Summer Scholars Opportunity at Cornell University Guess what, undergraduates! Cornell AgriTech in Geneva has received the green light to proceed with the 2021 season of the Summer...

    By Gale Perez
    Posted by - Program Representative
  • New/Unknown watergrass biotype in the field.
    Preliminary Herbicide Screening in Rice on Watergrass Species

    In 2017, I started getting reports of a watergrass biotype/species (Echinochloa spp.) that was difficult to control using our suite of herbicides registered in rice. At the time, I knew we had...

    By Whitney Brim-DeForest
    Author - County Director, Sutter and Yuba Counties and CE Rice and Wild Rice Advisor
  • video cover_Can weeds be beneficial?
    Can weeds be beneficial?

    Scott Stoddard, University of California Cooperative Extension (Merced County) Farm Advisor, takes a look at weeds in a corn field, cotton field and a ditch in the Dos Palos area. He discusses...

    By C. Scott Stoddard
    Author - County Director and Farm Advisor  Vegetable Crops and Soils
    By Gale Perez
    Posted by - Program Representative
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
UC Cooperative Extension
1710 Soscol Avenue
Suite 4
Napa, CA 94559-1315
Phone: 707-253-4221
Email: jaroncoroni@ucanr.edu

UC Weed Science Twitter