Pesticide Use Reporting Data Entry

Phytophora ramorum is fungus disease in oak trees that causes sudden death to members of this species, by interfering with the trees’ ability to transport food and water. The disease may be spread by the movement of nursery stock and other products made from unprocessed wood or wood products. There are many hardwood trees and shrubs that can spread the fungus. The disease occurs in the following counties in California, Alameda, Contra Costa, Humboldt, Lake, Marin, Mendocino, Monterey, Napa, San Francisco, San Mateo, Santa Clara, Santa Cruz, Solano, and Sonoma. The Federal Quarantine prohibits the movement of host material from the quarantine area into areas where the fungus is not established in order to protect and preserve the oak trees and oak woodlands, that are such an important part of the landscape in many areas of California.

Commercial nurseries who wish to ship products from the quarantine area must have a certificate issued by an authorized agricultural official affirming that the articles and commodities have been:

  • Produced and maintained in an area which has been inspected to assure that the articles are not infested
  • Grown in a manner that prevents infestation
  • Tested and found to be free of the pest.


Ventura County is a non-infested county and The California Department of Food and Agriculture contracts with the Agricultural Commissioner to conduct inspections in nurseries that ship host material interstate and to sample and test for the presence of the disease. This helps to prevent the spread of the disease from the infested area. This program is a part of the Pest Exclusion and Plant Protection Division.

Translate Disclaimer

The website has been translated for your convenience using translation software powered by Google Translate. Reasonable efforts have been made to provide an accurate translation, however, no automated translation is perfect nor is it intended to replace human translators. Translations are provided as a service to users of the website, and are provided “as is.” No warranty of any kind, either expressed or implied, is made as to the accuracy, reliability, or correctness of any translations made from English into any other language. Some content (such as images, videos, Flash, etc.) may not be accurately translated due to the limitations of the translation software.

The official text is the English version of the website. Any discrepancies or differences created in the translation are not binding and have no legal effect for compliance or enforcement purposes. If any questions arise related to the accuracy of the information contained in the translated website, please refer to the English version of the website which is the official version.