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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
  • Map from Calflora. Arrows and road names added by Ryan O'Dell.
    Invasion of Stinkwort into San Benito County

    Stinkwort (Dittrichia graveolens) is a very sticky annual weed in the sunflower family with a powerful smell similar to tarweeds (Brownsey et al. 2013). Its first observation in California was in...

    By Devii R. Rao
    Author - San Benito County Director and Area Livestock and Natural Resources Advisor
  • flyer California Rice Virtual Field Day
    EVENT :: CA Rice Virtual Field Day

    Mark your calendar... This field day is open to the public. Please share broadly to those who may be interested in attending. California Rice Virtual Field Day When: August 26, 2020, 1:00-3:00...

    By Gale Perez
    Posted by - Program Representative
  • Courtesy: Washington State Department of Agriculture Facebook
    Unsolicited seed packets reported across the United States

    ***** New information (7/30/2020): California Agricultural Commissioner's offices are collecting seeds locally. Please contact your county office (https://cacasa.org/county/). ***** Background In...

    By Whitney Brim-DeForest
    Author - County Director, Sutter and Yuba Counties and CE Rice and Wild Rice Advisor
    By Gale Perez
    Posted by - Program Representative
  • Where can you get CA DPR CE hours for wildland managers during COVID-19?

    Wildland herbicide applicators in California have to be licensed or have be supervised in the field by a licensed applicator. The California Department of Pesticide Regulation (DPR) requires all...

    By Chris McDonald
    Author - Inland and Desert Natural Resources Advisor, County Co-Director San Bernardino
  • Western Farm Press logo
    Weed control intensifies as harvest nears

    Have you seen Lee Allen's article in the Western Farm Press (July 15, 2020) on weed control in tree nut orchards? Here's the...

    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