A quarantine has been declared following the detection of the citrus disease Huanglongbing (HLB), or citrus greening, in multiple residential citrus trees within the City of Corona, Riverside County. The United States Department of Agriculture (USDA), the Riverside County, Orange County, and San Bernardino County agricultural commissioners, and the California Department of Food and Agriculture (CDFA) are working collaboratively on this project.
The 107-square mile quarantine area will link up with the east side of the existing quarantine in Los Angeles, Riverside, Orange, and San Bernardino counties, creating a contiguous 1,127-square-mile area. The new portion is bordered on the north by Chino Airport, on the south by Black Star Canyon, and on the east by Interstate 15. Quarantines are already in place for HLB in portions of Los Angeles, Orange, Riverside, and San Bernardino counties.
The quarantine prohibits the movement of all citrus nursery stock or plant parts out of the quarantine area. Provisions exist to allow the movement of commercially cleaned and packed citrus fruit. Fruit that is not commercially cleaned and packed, including residential citrus, such as oranges, lemons, grapefruits, and kumquats, must not be moved from the property on which it is grown, although it may be processed and/or consumed on the premises.
CDFA staff have scheduled removal of the infected trees and are in the midst of a treatment program for citrus trees to eliminate Asian citrus psyllid infestations within 400 meters of the find site. By taking this action, a critical reservoir of the disease and its vectors will be removed, which is essential to protect the surrounding citrus from this deadly disease.
CDFA, in partnership with the USDA, local county agricultural commissioners and the citrus industry, continues to pursue a strategy of controlling the spread of the Asian citrus psyllids while researchers work to find a cure for the disease.
To view a full HLB quarantine map, click here.
For more information: 
CDFA
Tel: +1 (916) 654-0462
Email: steve.lyle@cdfa.ca.gov
www.cdfa.ca.gov