Subtropical Fruit Crops Research & Education
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Subtropical Fruit Crops Research & Education

Posts Tagged: huanglongbing

Santa Barbara ACP News


Cressida Silvers

ACP/HLB Grower Liaison

Ventura, Santa Barbara and San Luis Obispo Counties

805 284-3310

Reminder of 2019 Fall ACP Area Wide Management Schedule

September 8 - 21: Carpinteria, Summerland, Montecito

September 15 - 28: Santa Barbara, Goleta, and the rest of the county


Here is the University of California website on ACP monitoring techniques and management recommendations:

If you are restricted in your choice of materials, applications of horticultural oil can be effective.

Remember to notify beekeepers in your area before treating by contacting the County Ag Department at 805 681-5600. Get additional information about the new on-line bee registration and notification system BeeWhere at .

ACP continues to be difficult to find in the field. This is a good thing, and we want to keep it that way, so please keep up the good work by continuing to monitor your trees and participate in the Area Wide Management Program.

Remember, difficulty finding ACP does not mean it is not present in the orchard, or not in surrounding residential citrus. The fact that ACP adults continue to show up in yellow sticky traps throughout the south county is a reminder of this. 


Secretary Ross Visits Santa Barbara County

CDFA Secretary Karen Ross visited Santa Barbara County last month to hear first hand how neighboring cannabis operations are impacting existing agriculture. Several citrus growers, PCAs, applicators, and I had the honor of speaking with Secretary Ross, along with representatives from the governor's office, CDFA, and the county agricultural commissioner's office. 


HLB Update

The most recent map and totals for all HLB detections in the state are posted at the website  As of August 2, a total of 1,534 trees and 256 ACP have tested positive for the HLB bacterium, on a total of 1,110 sites, all still in LA, Orange, and Riverside Counties. To date, all HLB detections have been on residential properties, the infected trees have been or are being removed, and ACP treatments applied on a recurring basis to remaining citrus in those areas. No HLB has been found in commercial groves.

Voluntary Best Practices for HLB protection

As HLB detections increase and spread, it's important to be aware of possible actions you could take to further protect your citrus should an HLB detection occur in your area. These Voluntary Best Practices can be found at the Citrus Insider website HERE.

Regulatory responses required by the state in response to an HLB detection are described in CDFA's Action Plan for ACP and HLB . 

 -- All meeting agendas and eventually the minutes are posted at . All meetings are free and open to the public, and accessible via phone/webinar.  

  • Operations and Outreach Subcommittees meeting date has changed to Wed, Aug 21. Outreach agenda is here, Operations Agenda is pending.

Additional Useful Links:

Summaries of the latest scientific research on combating HLB:

Science-based analyses to guide policy decisions, logistics, and operations:

General updates and information on the state ACP/HLB program and regional activities: 

ACP mounted
ACP mounted

Posted on Wednesday, August 14, 2019 at 6:49 AM
Tags: acp (82), area-wide spray (2), citrus (328), hlb (65), huanglongbing (65), psyllids (3)

Healthy Citrus Science

The summer issue of Citrograph has just been released, and our outreach project has been featured. Written by Sara García-Figuera, the article discusses our approach for educating citrus stakeholders, researchers, media and the general public about the nationwide technologies being developed to combat the devastating citrus disease – huanglongbing (HLB). Read more about all the tools available to growers and the general public at (pages 28-30)

ACP mounted
ACP mounted

Posted on Wednesday, July 24, 2019 at 7:37 AM
Tags: acp (82), asain citrus psyllid (1), citrus (328), hlb (65), huanglongbing (65)

Citrus HLB BMP's

Voluntary Best Practices for Growers' Response to Huanglongbing

To provide California citrus growers with a strong toolbox of science-supported strategies and tactics to protect their orchards from Huanglongbing, the Citrus Pest & Disease Prevention Committee endorsed a set of best practices for growers to voluntarily employ in response to HLB in California.

The recommendations – which are grouped based on a grower's proximity to an HLB detection – represent the most effective tools known to the citrus industry at this time and are meant to supplement the California Department of Food and Agriculture's required regulatory response. They were developed by a task force consisting of growers from various regions across the state and scientists, including Dr. Beth Grafton-Cardwell and Dr. Neil McRoberts.

Growers are encouraged to use as many methods as feasible for their operation in order to limit the spread of the Asian citrus psyllid (ACP) and HLB, as the cost to manage the Asian citrus psyllid is far less than any potential costs or loss to the industry should HLB take hold throughout our state.

The Best Practices at a Glance

The complete best practices document, which includes the scientific rationale for the best practices, can be downloaded here. The following grid is intended to provide a brief, digestible format of the best practices.

hlb defprmed citrus
hlb defprmed citrus

Posted on Monday, July 8, 2019 at 9:34 AM
Tags: ACP (82), Asian Citrus Psyllid (56), citrus (328), hlb (65), huanglongbing (65), lemon (99)

More ACP News and Information

At a recent workshop sponsored by the Ventura County ACP-HLB Task Force, presentations were made about the effectiveness of ACP suppression in the county, recommendations for voluntary grower responses to confirmed HLB-positive trees, area-wide treatment participation rates and other topics.  The speaker presentations have been posted online, and are available for review at:

ACP mounted
ACP mounted

Posted on Tuesday, July 2, 2019 at 8:05 AM
Tags: acp (82), asian citrus psyllid (56), citrus (328), hlb (65), huanglongbing (65)

Upcoming ACP-HLB Updates

Task Force to host Spring 2019 ACP-HLB update


Members of the Ventura County citrus community are invited to a workshop to review the most recent rounds of area-wide treatment, learn about plans for future treatment cycles, and hear about the latest research into psyllid suppression and disease management strategies.

The workshop will be from 9:30 to 11:30 a.m. on Thursday, May 23, at the Museum of Ventura County, 100 E. Main St., Ventura. The event is free, but advance registration is required. To reserve a spot, register online at


9:30 a.m.

Welcome, and update on status of HLB in California, including possible hot spots in Ventura County and quarantine implications for citrus operations:

Leslie Leavens, chair, Ventura County ACP-HLB Task Force.

10 a.m.

Scientific rationale behind voluntary grower action plan for HLB confirmations in commercial groves:

Neil McRoberts, western regional director, National Plant Diagnostic Network, and associate professor of plant pathology, UC Davis.

10:30 a.m. 

Managing Asian citrus psyllid and HLB in Southern California commercial groves:

Beth Grafton-Cardwell, IPM Specialist and Research Entomologist, University of California-Riverside, and Director of Lindcove Research and Extension Center.

11 a.m. 

Area-wide treatment completion rates for 2018-2019, and treatment schedule for 2019-2020:

John Krist, CEO, Farm Bureau of Ventura County.

11:15 a.m.

Audience Q&A

11:30 a.m.


Click here to download a copy of the treatment schedule for 2019-2020.

New Huanglongbing Detection in Riverside


A residential citrus tree in the city of Riverside has tested positive for Huanglongbing (HLB). The citrus tree was located on a previous detection site from 2017. This is the first HLB detection in Riverside County since 2017. The California Department of Food and Agriculture is in the process of removing the HLB-positive tree.

In addition to removing the HLB-positive tree, CDFA has pulled samples from all other citrus trees on the property for testing and is in the process of beginning treatment of all host plants within 400 meters of the detection site.

Since this new detection occurred on the same property as a previous find, there will not be a change to the current HLB quarantine area or Asian citrus psyllid quarantine zones.

Citrus growers and pest control advisers in Riverside County should reach out to the county's Grower Liaison Alan Washburn at or 951-683-2392 with questions and to seek recommendations on how to protect their orchards.

HLB symptoms
HLB symptoms

Posted on Wednesday, May 15, 2019 at 6:18 AM

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