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As of December 4, a total of 2,196 residential trees and 321 ACP have tested positive via PCR for the bacterium that causes HLB. See the latest HLB map and table for details: maps.cdfa.ca.gov/WeeklyACPMaps/HLBWeb/HLB_Treatments.pdf. As before, the infected trees have been or are being removed, and ACP treatments are applied on a recurring basis to remaining citrus in those areas. To date, no HLB has been found in commercial trees via PCR testing. The HLB quarantine area, however, includes commercial citrus and continues to expand.
Please refer to the CDFA Action Plan for ACP and HLB for information on regulatory and treatment requirements to expect should HLB be detected in or near your citrus grove or packing house.
Best Practices in the Field
In addition to monitoring and treating for ACP, another important way to protect your citrus from ACP and HLB is to follow Best Practices in the field, including insisting that all equipment, vehicles and bins be free of all plant material before entering your property.
Download or stream this video to help refresh field crews on the best practices for avoiding the spread of ACP and HLB during harvest.
ACP/HLB Resources
- Sign up for program updates from the Citrus Pest and Disease Prevention Division at www.cdfa/signup-email-updates.
- General information on the state ACP/HLB program including maps, quarantine information, and a signup option for email alerts: citrusinsider.org/
- Biology of ACP and HLB, detection maps and recommendations for monitoring, eradication and management: ucanr.edu/sites/acp/
- UC Ag Experts Talk presentation "ACP for Commercial Growers and Pest Control Advisors", now available for viewing, along with other past talks on various citrus pests, at https://ucanr.edu/sites/ucexpertstalk/Past_Webinars/
- Web-based map to find out how close you are to HLB: ucanr.edu/hlbgrowerapp
- Summaries of the latest research to combat HLB: ucanr.edu/sites/scienceforcitrushealth/
- Science-based analyses to guide policy decisions, logistics, and operations: www.datoc.us
ACP Update
ACP trap detections have increased recently on the coast and in the Central Valley. While we usually see trap numbers peak this time of year, this fall the numbers have been higher than the last few years. Please stay vigilant in monitoring your trees for ACP, treating for ACP during the Area Wide Management treatment windows, and using an ACP-effective insecticide if possible when conducting other orchard management applications.
Map of HLB Quarantine and Treatment Area in California
HLB quarantine area 2020 dec
