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Napa County UCCE
University of California
Napa County UCCE

Weed Science

Program Focus

PERENNIAL CROPS
Weed control and identification
Vegetation management
Covercrop information

FIELD TRIALS – WEED CONTROL
Timing of herbicide applications
Effect of leaf litter on the efficacy of treatments
New organic herbicides with organic growers

 

Questions?

If you have a question or a concern related to weed management, vineyard or orchard floor management, or need assistance in the identification of a weed species, please call or e-mail me. 

UC Master Gardeners of Napa County are available to assist homeowners with weed questions.

 

Photo of John A Roncoroni John A Roncoroni
Title: Weed Science Farm Advisor
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

 

Wines & Vines Article - 7/22/14

UC Weed Science Farm Advisor, John Roncoroni details results of vineyard studies in the current issue of Wines & Vines.  Read the article,  "The Efficacy of Weed Killers" written by Paul Franson.  For additional information contact John Roncoroni at jaroncoroni@ucanr.edu.

2013 Weed Control Trial

Read the test results of a 22-treatment herbicide weed control trial conducted in Napa County in 2013.

New Weed Management Book

Order now!
Order now! - Weed Control in Natural Areas in the Western United States

Webmaster Email: priscilla.rodrigues@countyofnapa.org