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Citrus Greening Quarantine Areas on the Grow in California

By USDA-APHIS|September 9, 2026

USDA’s Animal and Plant Health Inspection Service (APHIS), in cooperation with the California Department of Food and Agriculture (CDFA), is expanding the citrus greening (aka, HLB) quarantined area in California.

APHIS is adding the following to already established citrus greening quarantine areas: one square mile to the Santa Paula quarantined area in Ventura County, which impacts 151.7 acres of commercial citrus; and 10 square miles to the quarantined area in Riverside and San Diego counties, which impacts 121.5 acres of commercial citrus.

This measure parallels the intrastate quarantine that CDFA established on July 15, 2026. APHIS is taking this action because plant tissue samples from residential properties tested positive for Candidatus Liberibacter asiaticus, the causal agent of HLB.

And just a few weeks ago, CDFA and APHIS confirmed the detection of HLB in one tree on a residential property in the city of Calexico, Imperial County, triggering a quarantine. That is the first HLB detection in the county.

APHIS is applying safeguarding measures outlined in 7 Code of Federal Regulations (CFR) 301.76 through 301.76-11 and associated Federal Orders that govern interstate movement of regulated articles from the quarantined areas. This action helps prevent HLB from spreading to areas that are not currently infested.

For more information and to view the latest quarantine maps, visit aphis.usda.gov.

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USDA's Animal and Plant Health Inspection Service (APHIS) protects the health of U.S. agriculture and natural resources against invasive pests and diseases, regulates genetically engineered crops, administers the Animal Welfare Act, and helps people and wildlife coexist. APHIS also certifies the health of U.S. agricultural exports and resolves phytosanitary and sanitary issues to open, expand, and maintain markets for U.S plant and animal products. See all author stories here.