California’s Asian Citrus Psyllid Quarantine Expands

A 64-square-mile quarantine is in place in northern San Mateo County for the Asian citrus psyllid (ACP). The quarantine was established following the detection of two psyllids within the cities of Pacifica and Daly City.

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The quarantine also takes in the southern portion of San Francisco County along its border with San Mateo County.

Since first being found in California in 2008, the Asian citrus psyllid has slowly been spreading throughout California and there are now county-wide quarantines in place in Imperial, Los Angeles, Orange, Riverside, San Bernardino, San Diego, Santa Barbara, Tulare, and Ventura Counties, with portions of Alameda, Fresno, Kern, Madera, Merced, San Benito, San Joaquin, San Luis Obispo, Santa Clara, and Stanislaus counties also under quarantine.

Since the detection of Asian citrus psyllids in Daly City and Pacifica in late October, no additional psyllids have been found. Treatment of citrus trees within 400 meters of the detections sites has been completed. Traps for ACP have been placed throughout San Mateo County and monitoring will continue through December and then resume in the spring

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