Citrus Greening on the Move in Southern California
November 25, 2019 
The fruit on this tree is showing the effects of citrus greening. A recent find of the disease has triggered a new citrus quarantine alert in Southern California.
Photo courtesy of UF/IFAS
A quarantine has been declared following the discovery of citrus greening (HLB) in a single tree in an unincorporated area of San Bernardino County near Montclair, reports the California Department of Food and Agriculture (CDFA). This is the first time the plant disease has been detected in San Bernardino County.
The 93-square mile quarantine area will link up with existing quarantines in Los Angeles and Orange Counties, creating a contiguous 1,015-square-mile area.
HLB quarantine maps for San Bernardino and Los Angeles counties can be viewed at: https://www.cdfa.ca.gov/plant/hlb/regulation.html.
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.
Quarantines are already in place for HLB in portions of Los Angeles, Orange and Riverside counties.
CDFA staff have scheduled removal of the infected tree and are in the midst of a treatment program for citrus trees to knock down Asian citrus psyllid (the vector of the disease) infestations within 400 meters of the find site.
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