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California Safe Raisin Production Documented

California Safe Raisin Production Documented


Stephen Vasquez has teamed up with USDA-ARS Scientist Jeffery Palumbo to explore if San Joaquin Valley vineyards harbor fungi that produce ochratoxins; a known carcinogen. For the past 5-6 years, Asian and European countries have been testing for the presence of ochratoxins in grape products: fresh grapes, raisins, juice and wine. Commonly found in Mediterranean and South American grape growing regions, Aspergillus species, fungi that produce ochratoxin-A have been identified in California’s vineyards. Vasquez focused on raisins since the industry is changing from tray-dried to dried-on-the-vine (DOV) production. The difference in the two production systems is a cooler, higher humidity environment found in DOV vineyards, which is conducive to fungal growth. Raisins were collected from DOV vineyards prior to processing and sent to Palumbo for fungal morphological and DNA analysis. Results showed that in unprocessed raisins, ochratoxin can be isolated at levels well below the threshold set by raisin importing countries. It is expected that raisins processed by California raisin packers would further decrease the amount of detectable ochratoxin.  Raisin grape growers are confident that their product is safe and meets the ochratoxin test levels set by Asian and EU counties.

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In the News

Tomato Virus Disease Concerns

Tomato virus disease concerns at UC West Side Extension Center

Among the obvious concerns that vegetable crop growers face this season is the potential of a second consecutive year for curly top disease in tomatoes. In 2013, some fields in Fresno, Kings and Kern Counties were severely impacted by this beet leafhopper-transmitted virus disease. In some fields, the majority of the plants were lost early in the season and the fields were replanted, while in other cases, the impact was seen too late to replant and the fields may have been shredded or farmed to harvest, frequently, with disappointing yields.

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The University of California Division of Agriculture and Natural Resources (ANR) is a statewide network of campus based Agricultural Experiment Station researchers and Cooperative Extension specialists located on the Berkeley, Davis and Riverside campuses working collaboratively with county-based Cooperative Extension advisors located in 50 county offices throughout the state.



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