A Huanglongbing (HLB) quarantine is now in effect in part of Los Angeles County following the detection of HLB in four citrus trees.

On July 10, a kumquat tree on a residential property was confirmed to be infected with the incurable HLB disease. After extensive surveying and testing in the area, three more diseased trees were found nearby. The four diseased trees were on four separate properties close to one another. The tree varieties include kumquat, lime, mandarin and calamondin.

California Department of Food and Agriculture (CDFA) has already removed two of the diseased trees and is currently working with the homeowners at the other two properties to remove those trees as soon as possible. See the CDFA press release below for more details on the resulting quarantine.

QUARANTINE FOR HUANGLONGBING DECLARED IN SAN GABRIEL, LOS ANGELES COUNTY

SACRAMENTO, July 22, 2015 – An 87-square mile quarantine in the San Gabriel area of Los Angeles County has been added to the existing huanglongbing (HLB) quarantine in the Hacienda Heights-area following the detection of the citrus disease huanglongbing, or citrus greening.

Additional information, including a map of the quarantine zone, is available at the CDFA Save Our Citrus website.  The quarantine boundaries are: on the north, E. Orange Grove Boulevard; on the east, N. Lemon Avenue; on the west, Griffin Avenue; and on the south W. La Habra Boulevard.

This area is part of a much larger quarantine already in place for the Asian citrus psyllid (ACP), the pest that spreads bacteria causing huanglongbing (HLB). The new quarantine will prohibit the movement of all nursery stock out of the area, while maintaining existing provisions allowing the movement of only commercially cleaned and packed citrus fruit. Any fruit that is not commercially cleaned and packed, including residential citrus, must not be removed from the property on which it is grown, although it may be processed and/or consumed on the premises.

“The success of any quarantine depends on cooperation from those affected,” said CDFA Secretary Karen Ross. “The stakes couldn’t be higher for California citrus. We urge residents in the San Gabriel-area to do all they can to comply.”

CDFA, the USDA and the Los Angeles County Agricultural Commissioner’s continue their work to investigate the source of the disease, to survey and test for it throughout the Los Angeles Basin, and to continue with ground treatment of citrus trees within 800 meters of the find sites – which began earlier this week. In the long term, the strategy is to control the spread of ACPs while researchers work to find a cure for the disease.

Huanglongbing has been confirmed four times in San Gabriel, in a kumquat tree on a residential property, in a lime tree on an adjacent residential property, and in calamondin and mandarin trees on residential properties in close proximity to the original find. The disease is bacterial and attacks the vascular system of plants. It does not pose a threat to humans or animals. The Asian citrus psyllid can spread the bacteria as the pest feeds on citrus trees and other related plants. Once a tree is infected, there is no cure; it typically declines and dies within a few years.

Huanglongbing is known to be present in Mexico and in parts of the southern U.S. Florida first detected the disease in 2005, and the University of Florida estimates that the disease causes an average loss of 7,513 jobs per year, and has cost growers $2.994 billion in lost revenue since then. Huanglongbing has also been detected in Georgia, Louisiana, South Carolina and Texas as well as Puerto Rico and the U.S. Virgin Islands.

A total of 15 states or territories are under full or partial quarantine due to the presence of the ACP: Alabama, American Samoa, Arizona, California, Florida, Georgia, Guam, Hawaii, Louisiana, Mississippi, Northern Mariana Islands, Puerto Rico, South Carolina, Texas, and the U.S. Virgin Islands.

The Asian citrus psyllid was first detected in California in 2008 and quarantines for the pest are now in place in 17 California counties. If Californians believe they have seen evidence of huanglongbing in local citrus trees, they are asked to please call CDFA’s toll-free pest hotline at 1-800-491-1899 FREE. For more information on the Asian citrus psyllid and huanglongbing, please visit: http://www.cdfa.ca.gov/phpps/acp/.