Weed control and identification
FIELD TRIALS – WEED CONTROL
Timing of herbicide applications
Effect of leaf litter on the efficacy of treatments
New organic herbicides with organic growers
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.
John A Roncoroni
Title: Weed Science Farm Advisor
Specialty: Weed Control and Vegetation Management in Perennial Crops, Covercrops and Aquatic Weed Control
UC Cooperative Extension
1710 Soscol Avenue
Napa, CA 94559-1315
Phone: (707) 253-4221
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 firstname.lastname@example.org.
Update - Latest Field Ratings
Read the details of field trial - plots were treated on February 5, 2014.
Read the update on the latest field ratings.
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! - Weed Control in Natural Areas in the Western United States