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Agriculture Officials in the Community | Protecting Citrus Trees

Post Date:12/24/2019 2:50 PM

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.  HLB quarantine maps are available online at:

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.

HLB is a bacterial disease that affects the vascular system of the 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 plants.  Once a tree is infected, there is no cure, the tree will produce bitter and misshaped fruit and dies within a few years.

Residents are urged to take several steps to help protect citrus trees:

• Do not move citrus plants, leaves, or foliage into or out of the quarantine area or across state or international borders.  Keep it local.
• Cooperate with agricultural officials placing traps, inspecting trees, and treating for the pest.
• If you no longer wish to care for your citrus tree, consider removing it so it does not become a host to the pest and disease.

Agricultural officials will leave notices at your home and will not access your property without your consent. They are looking for a citrus tree disease to protect other community citrus. Watch this video to learn more:


Click here to read the CDFA official press release. For more information, please visit or call the hotline at 1-800-491-1899.

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