Grapes

rows of vineyard being grazed by sheep and goats

Event

Central Sierra: Grazing in the Vineyard

Jun 24, 2025

Grazing in the Vineyard with Delfino FarmsA hands-on workshop about livestock grazing in vineyards. Our program includes: Basics of vineyard grazing and suitabilityReasons to graze your vineyardVineyard:Livestock:Forage relationshipHosted by UC Cooperative Extension Livestock and Natural Resources…

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Closeup of leaf being scanned by the Leaf Monitor tool

Article

AI tool to help farmers measure real-time crop health from the field

September 24, 2025

Leaf Monitor, a new mobile tool backed by artificial intelligence and predictive modeling, could revolutionize how farmers monitor crops and make decisions by providing real-time nutrition and leaf trait information in the field.

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Joy Hollingsworth holds a microphone and stands in a vineyard discussing her research on the red-colored panels attached to the trellises

Article

Grape Day shows San Joaquin Valley growers ‘what works in our area, for our crops’

August 20, 2025

By Michael Hsu

Wine, table and raisin grape growers gathered for Grape Day at the Kearney Agricultural Research and Extension Center to hear about the latest innovations from UC scientists.

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At Mendocino Grape Day event, Chris Chen engages with local growers

Article

Advisor Chen works for resilient future for viticulture in Northern California

April 14, 2025

By Matthew Barnes

Christopher Chen, UC Cooperative Extension integrated vineyard systems advisor for Lake, Mendocino and Sonoma counties, works to ensure that the vineyards that produce the region’s world-renowned wines can thrive amid the challenges of climate change, wildfires and water scarcity.

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A prescribed burn at the UC ANR Hopland Research and Extension Center (2024)

Article

UC researchers study smoke risk to vineyards from prescribed grassland fires

March 27, 2025

By Christopher C Chen

In the winegrape vineyards of northern California, fire and its associated smoke pose a unique threat in the form of smoke-taint damage to the fruit. A preliminary study looks at whether prescribed burning as a fire prevention method poses a risk to winegrape crops.

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Grape Pests & Diseases

The University of California has an extensive Integrated Pest Management (IPM) website with a comprehensive section for grapes, including a year-round IPM program and guidelines. The UC IPM guidelines are an excellent source of information on managing pests.

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Weed Control in Vineyards

Weed control in vineyards enhances the establishment of newly planted vines and improves the growth and yield of established vines.

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Threecornered alfalfa hopper degree day model

The threecornered alfalfa hopper (TCAH) is a vector of Grapevine red blotch virus that causes Grapevine red blotch disease in vineyards. A degree day model was developed to predict the ideal time frame for ground cover management to help reduce TCAH populations in vineyards.

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Plant Pathology

Program OverviewThe Plant Pathology Program provides applied research and outreach to support agricultural production across Imperial, Riverside, and San Diego counties. This tri-county region encompasses a wide diversity of crops and growing conditions—from the desert-irrigated systems of Imperial Valley to…

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Grapes

When to plant: February–March Harvest window: July–October, depending on variety Fertilization: Light (if any) nitrogen in the spring; monitor for possible zinc and potassium needs Prune in dormant season, using the pruning system (cane or spur pruning) based on grape variety.

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