Agriculture officials have expanded the areas quarantined for citrus greening disease (known as huanglongbing or HLB) in California. The quarantined area in the Corona area of Riverside County was expanded by 37 square miles. The San Juan Capistrano quarantined area of Orange County was expanded by 18 square miles. The actions were taken by the U.S. Department of Agriculture Animal and Plant Health Inspection Service (APHIS) in cooperation with the California Department of Food and Agriculture (CDFA).
The measures parallel the intrastate quarantines that CDFA established on Dec. 5 and 15, 2025. APHIS took 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 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 website contains specific changes to the quarantined areas in California. APHIS will publish a notice of this change in the Federal Register.
Areas quarantined for HLB in California have been expanded at least five times in the past year. The most recent previous expansion was on Nov. 25, 2025. APHIS announced the expansion of both HLB and sweet orange scab quarantines then. Learn more here.
Source: APHIS
Share this Post