Caution - CDFA Confirms LA County Areas Affected by HLB

On December 29, 2023 the California Department of Food and Agriculture (CDFA) confirmed the presence of the causative bacteria of the citrus disease huanglongbing (HLB) in plant tissue and insect vectors located in San Gabriel. HLB is a devastating disease of citrus and is spread through feeding action be populations of the Asian citrus psyllid (ACP), Diaphorina citri Kuwayama.

The detection required the expansion of the emergency program area to include the communities of Alhambra, Alondra Park, Altadena, Arcadia, Artesia, Avocado Heights, Azusa, Baldwin Park, Bell, Bell Gardens, Bellflower, Bradbury, Carson, Cerritos, Charter Oak, Citrus, Claremont, Commerce, Compton, Covina, Cudahy, Del Aire, Diamond Bar, Downey, Duarte, East Los Angeles, East Pasadena, East Rancho Dominguez, East San Gabriel, East Whittier, El Monte, Florence-Graham, Gardena, Glendora, Hacienda Heights, Hawaiian Gardens, Hawthorne, Huntington Park, Industry, Inglewood, Irwindale, La Habra Heights, La Mirada, La Puente, La Verne, Ladera Heights, Lakewood, Lawndale, Lennox, Lomita, Long Beach, Los Angeles, Lynwood, Mayflower Village, Maywood, Monrovia, Montebello, Monterey Park, North El Monte, Norwalk, Palos Verdes Estates, Paramount, Pasadena, Pico Rivera, Pomona, Rancho Palos Verdes, Rolling Hills, Rolling Hills Estates, Rose Hills, Rosemead, Rowland Heights, San Dimas, San Gabriel, San Marino, San Pasqual, Santa Fe Springs, Sierra Madre, Signal Hill, South El Monte, South Gate, South Monrovia Island, South Pasadena, South San Gabriel, South San Jose Hills, South Whittier, Temple City, Torrance, Valinda, Vernon, View Park-Windsor Hills, Vincent, Walnut, Walnut Park, West Athens, West Carson, West Covina, West Puente Valley, West Rancho Dominguez, West Whittier-Los Nietos, Westmont, Whittier, Willowbrook in Los Angeles County.

Surveillance of infestation and treatment will be administered throughout the County.

To learn more about this issue, please visit for more information from the CDFA.

To read in more detail about surveillance and treatment and control of ACP please read the following: OFFICIAL NOTICE - PROCLAMATION OF EMERGENCY PROGRAM FOR ASIAN CITRUS PSYLLID AND HUANGLONGBING