Ongoing research

When to start irrigating Vine leaf water potential (LWP) is an indirect measure of vine water status that is usually monitored weekly prior to the onset of irrigation. LWP is most accurately measured with a pressure chamber device. Units of LWP are negative bars or megapascals (MPa).

Vineyard Irrigation Scheduling Worksheet (Interactive) This worksheet provides the means to calculate the amount of water to apply in a winegrape vineyard based on the deficit irrigation strategy fully detailed in the publication "Deficit Irrigation of Quality Winegrapes Using Micro-Irrigation Techn...

How to Calculate Distribution Uniformity and Adjust Irrigation RequirementsDistribution uniformity is expressed as a percentage, and is a relative index of the variability between emitters in an irrigation block.  Distribution uniformity is defined as the average discharge of 25% of the sampled emitters…

Pierce's Disease Insect Vectors Glassy Winged Sharpshooter identification. Grape Pest Notes Identification and monitoring information for arthropod grape pests and fungal diseases. Grapevine Red Blotch Disease Grapevine Red Blotch information and identification.

Glassy-winged sharpshooter (GWSS) is a serious new pest in California. Like other sharpshooters, the GWSS spreads Xylella fastidiosa, the bacterium that causes Pierce's disease in grapevines.

How to Distinguish Among Different MealybugsWhich mealybug is it?

European Grapevine Moth Biology European Grapevine Moth: a New Pest of Grapes in California (CAPCA Adviser Magazine July 2010) European Grapevine Moth in Napa Valley Vineyards (Practical Winery & Vineyard, Mar/Apr 2010) European Grapevine Moth Grape Day Handout, February 2010 En Espaol: La Polilla d...

An searchable table of selected labs and services can be found here: Interactive Table For an downloadable list of selected plant and soil labs in northern and central California, please visit our website at: https://ucanr.

UCCE - Needs Assessments Part of serving the community is understanding the needs and wants of the region we are active in.

...