APHIS Adds Del Norte County in California to Phytophthora ramorum Quarantine Area


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May 21, 2021



Subject:           APHIS Adds Del Norte County in California to Phytophthora ramorum Quarantine Area

To:                  State and Territory Agricultural Regulatory Officials

Effective immediately, the Animal and Plant Health Inspection Service (APHIS) is expanding the Phytophthora ramorum (P. ramorum) quarantine area in Del Norte County, California. APHIS is taking this action in response to the confirmation of P. ramorum in the county on September 19, 2020. The California Department of Food and Agriculture has established an intrastate quarantine for the areas in Del Norte County that mirrors the federal regulatory requirements as specified in 7 CFR 301.92.

P.ramorum is the pathogen that causes sudden oak death, ramorum leaf blight, or ramorum dieback. Sudden oak death was first reported in 1995 on tan oak in Mill Valley, Marin County, California.

Through ongoing surveys, APHIS continues to define the extent of the pathogen's distribution in the United States and uses quarantine areas and public outreach to limit its artificial spread beyond infected areas. Details on APHIS-designated P. ramorum quarantine and regulated areas and the conditions to move regulated articles are in 7 CFR 301.92 and at:


For more information about the P. ramorum program and federal regulations, please contact National Policy Manager, William Wesela, 301-851-2229.



Dr. Osama El-Lissy
Deputy Administrator
Plant Protection and Quarantine


Attachment: Federal Order