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The University of California does not provide soil or plant tissue testing services for growers.  There are a number of laboratories that do provide this service.

List of soil and plant tissue testing labs.

List of labs that test for Red blotch.

UC does not endorse any one laboratory and we recognize this list may not be complete.

Foothill Soils: link to our soils page found under the Viticulture menu. Provides information and links to access the soil survey online via UC Soils Specialist Toby O'Geen's Soil Web.  Useful for growers of all crops.

Diagnosing Soil Physical Problems: link to FREE UC publication.  Scan of historic UCANR leaflet first printed in 1976, still a valuable resource.  By UC Soils Extension Specialist William Wildman.

Grapevine nutrition: link to our grape nutrition page found under the Viticulture menu.  Provides information on how to petiole sample.

Stone fruit nutrition: link to our stone fruit nutritional disorders page found under the Orchard Crops, Stone Fruit menu.

Groundwater testing and monitoring: link to FREE UC publication by Thomas Harter, UC Cooperative Extension Hydrogeology Specialist.  Gives information for testing well water.

Evaluating Water Quality: link to FREE UC publication on self-evaluating water quality by Terry Hall, USDA-NRCS San Benito County

Facts about Serpentine Rocks and Soil containing Asbestos in California: link to FREE UC publication by UCANR experts Rachel Elkins, Toby O'Geen, Robert Reynolds and James Meyers.

Web Soil Survey - Web Soil Survey (WSS) provides soil data and information produced by the National Cooperative Soil Survey. It is operated by the USDA Natural Resources Conservation Service (NRCS) and provides access to the largest natural resource information system in the world.