Southern California citrus quarantine zone expanded

California: Citrus disease infects five trees in Rancho Cucamonga

The spread of Huanglongbing continues across California’s San Bernardino County, with the discovery of five diseased trees in Rancho Cucamonga in September. The detection of the infected trees on two residential properties marks the first time in history that citrus greening disease, also called Huanglongbing or HLB, has been found in Rancho Cucamonga.

Previously, HLB had been found in one tree in San Bernardino, four trees in Montclair, one tree in Ontario and four trees in Colton, said Victoria Hornbaker, director for the Citrus Pest and Disease Prevention Division of California Department of Food and Agriculture on Tuesday, Sept. 29.

As a result of the Rancho Cucamonga finds, 79 square miles were added to an already sprawling Southern California citrus quarantine zone. The addition creates a 1,415-square-mile quarantine area taking in parts of Los Angeles, Orange, San Bernardino and Riverside counties.


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