APHIS Expands the Citrus Greening (Huanglongbing) Quarantined Area in California

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FOR INFORMATION AND ACTION 
DA-2025-37 
September 15, 2025 

Subject: APHIS Expands the Citrus Greening (Huanglongbing) Quarantined Area in California 

To: State, Tribal, and Territory Agricultural Regulatory Officials 

Effective immediately, the Animal and Plant Health Inspection Service (APHIS), in cooperation with the California Department of Food and Agriculture (CDFA), is expanding the areas quarantined for citrus greening (Huanglongbing; HLB), caused by Candidatus Liberibacter asiaticus, in California. APHIS is expanding the quarantined area in the San Clemente Area of Orange and San Diego Counties by 81 square miles. These measures parallel the intrastate quarantines that CDFA established on September 9, 2025. 

APHIS is taking this action because of a citrus greening detection in a plant tissue sample collected from a residential property in Orange County. There are two acres of commercial citrus impacted by this expansion. APHIS is applying safeguarding measures outlined in 7 CFR 301.76 and Federal Orders pertaining to the interstate movement of regulated articles from the quarantined areas in California. This action is necessary to prevent the spread of citrus greening to non-infested areas of the United States. 

The APHIS Citrus Greening web page contains specific changes to the quarantined areas in California. APHIS will publish a notice of this change in the Federal Register.

For additional information, you may contact: 


/s/

Matthew A. Rhoads 
Acting Deputy Administrator 
Plant Protection and Quarantine