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

FOR INFORMATION AND ACTION 
DA-2026-01 
January 6, 2026 

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 area quarantined for citrus greening (Huanglongbing; HLB), caused by Candidatus Liberibacter asiaticus, in California. APHIS is expanding the quarantined area in the Corona area of Riverside County by 37 square miles, and the San Juan Capistrano area of Orange County by 18 square miles. These measures parallel the intrastate quarantines that CDFA established on December 5 and 15, 2025, respectively.  APHIS is taking this action because of citrus greening detections in plant tissue samples collected from residential properties in Riverside and Orange Counties. There are 26.5 acres of commercial citrus impacted by the Corona area expansion and 267 acres of commercial citrus impacted by the San Juan Capistrano area 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 webpage 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: 

Abby R. Stilwell Agriculturist
(919) 323 -6296
abby.r.stilwell@usda.gov 

/s/

Matthew A. Rhoads 
Acting Deputy Administrator 
Plant Protection and Quarantine