CLas-Positive ACP Detection Near Tijuana

Inland Empire/Desert Southern California

An Asian citrus psyllid (ACP) sample – confirmed positive for Candidatus Liberibacter asiaticus (CLas) – was collected approximately seven miles south of the U.S.-Mexico border on the eastern outskirts of Tijuana, Mexico earlier this month. This area does not have any commercial citrus production or nurseries nearby.

This is the first time that a CLas-positive psyllid sample has been found in the area since the United States Department of Agriculture (USDA) began its cooperative program with Mexico. The USDA works cooperatively with Mexico to conduct area wide treatments, biocontrol and surveys in the border region to help prevent the spread of Huanglongbing (HLB). A 400-meter radius around the find site is being treated. Additional ACP samples in the same area are being collected for testing. This ACP detection does not result in a U.S. quarantine expansion.

The best way prevent the spread of ACP into commercial citrus groves is to monitor for the pest and disease symptoms and follow the UC Integrated Pest Management treatment guidelines: ipm.ucanr.edu/PMG/r107304411.html. Do not move citrus plants, foliage or fruit into or out of your area, and especially across state or international borders. This could unknowingly contribute to spread of the pest and disease.

If you see suspect ACP or HLB symptoms in your orchard, please notify the California Department of Food and Agriculture Pest Hotline immediately at 800-491-1899.


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