The California Department of Food and Agriculture has extended the Huanglongbing (HLB) quarantine in San Diego County after a positive HLB case was detected in a mandarin tree in Fallbrook. A mandatory quarantine zone has been established, covering a 5-mile radius from the point of detection, where the movement of all host nursery stock and host plants is restricted. This has also resulted in the expansion of the Regional Citrus Bulk Quarantine Zone 6, affecting other areas of San Diego County. Commercial citrus growers in the affected area are required to implement additional mitigation measures for the transportation of citrus products.