Quarantine Area for Citrus Greening on the Grow in California

USDA’s 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 (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 U.S.

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

For additional information, visit aphis.usda.gov.