Grapes

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.

Winegrapes homepage with basic information regarding wine grape production in the foothills

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…

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.

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.

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