Past projects

View our completed projects, including full policy briefings, below. 

January, 20120

DATOC has produced guidelines for citrus growers who choose to use an EDT (for example, detector canines) to screen their groves.

October, 2019 

The goal of this analysis was to understand how likely it is for a site with 1 HLB-positive tree to develop another HLB-positive tree in the future.

Exposure to huanglonbing in Souther California

June, 2019

DATOC compiled available research to help the CPDPC advise growers on how they should respond to an HLB find in or near their commercial grove. This was the basis of the "Best Management Practices in Response to Huanglongbing in California Citrus", approved by the CPDPC and published on

Ct Value CA HLB CLa

March, 2019 

Examination of the possibility to define a rigorous meaning for the word "exposed", as used in the California agriculture code, in relation to HLB

December, 2018

Analysis of transportation risk of CLas+ ACP between bulk citrus quarantine zones in California.

October, 2018

Field cleaning by hand has not been shown to reduce the number of psyllids in bulk citrus bins or the potential risk of moving psyllids when the fruit is moved. 

October, 2017

An analysis of critical factors which determine the efficacy of areawide buffer treatments mitigation of ACP/HLB risk for commercial groves.

The intensity of the HLB epidemic has recently undergone an exponential increase. A rapid response should implement additional measures to slow the rate of spread.

Density of new infections

October, 2019 

As a part of DATOC's report on exposure to CLas in Southern California residential areas, DATOC was asked to evaluate exposure over smaller geographic scales. We also evaluated the changes in infection density in the most recent detections.

June, 2019

There is no evidence thus far for seasonal patterns of Ct value variability from CA CLas+ plant samples.

Ct Value CA HLB CLa

March 2019

An analysis of the growth rate in new detections of HLB in Southern California, to help determine if a threshold has been reached beyond which current management practices are unfeasible.

February, 2019

The CDFA action plan previously called for sampling 25% of an orchard should HLB be found within 400m. Best available evidence indicated that would be inefficient. DATOC suggested an evidence-based replacement plan, which was approved in March 2019.

December, 2018

A report released in December 2018 on vertical transmission of CLas from ACP parent to progeny.

October, 2018 

The DATOC expert panel feels strongly that the find of a single Asian citrus psyllid (ACP) in an area which is not generally infested and eradication is still being attempted should trigger a treatment area around the detection that is never less than a 400 m radius.

The industry should utilize geographically regulated areas to restrict ACP dispersal.

Works on this website are licensed under a Creative Commons Attribution 4.0 International License.

DATOC is sponsored by the Citrus Research Board and the California Citrus Pest and Disease Prevention Program.