DATOC Projects

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Criteria for reducing the delimitation radius

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This report proposes that the delimitation radius for tree surveys around an HLB+ tree be reduced from 400m to 300m. This change is suggested based on the geographic distribution of all trees confirmed to be positive for huanglongbing by March 2020, based on a methodology previously used by the CPDPC to make operational decisions.

Final report (if available):

Areawide Management Strategy

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Residential buffer zones around commercial citrus can be treated by CDFA with insecticides to suppress Asian citrus psyllid populations only if 90% of growers in that region apply insecticides within a designated 3-week window. While useful, this threshold created logistical difficulties and a new criterion for treatment was explored.

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Equitable and effective transport quarantines

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

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Buffer treatments efficacy

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

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Treatment area recommendation

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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.

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Hand cleaning bulk citrus

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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.

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Transovarial transmission of CLas

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

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Managing transportation risk

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

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Recommended sampling plan

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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.

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Evaluating exposure to HLB

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

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Growth of disease incidence in Southern California

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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.

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Recommended grower responses to HLB

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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 CitrusInsider.org.

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Seasonality of Ct Values in CA plant samples

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

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Exposure on repeat properties

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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.

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Density of new infections

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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.

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Early Detection Technology Guidelines

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

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Hot Spot Cluster Analysis

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Dr. Dave Bartels of the USDA has previously provided cluster maps to various groups. DATOC will be assuming responsibility for the production of these maps to provide the CPDPP committees with on-going analysis of the epidemic, to help with resource allocation decisions

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State of the State

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In 2017, DATOC produced a summaryt of the development of HLB in CA and the expansion of ACP. DATOC is working on an update to this document.

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Time series analysis of ACP

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The presence of ACP in California has been tracked by various programs and projects for several years. This analysis will construct a time series for various California regions since the start of these activities.

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Distribution of leaf material in pilot program

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The CDFA recently implemented a pilot program which will allow citrus growers to utilize grates as an alternative mitigation strategy for disinfesting loads of bulk citrus. DATOC is analyzing the results of this program to help inform a recommended sampling plan if the grate systems are adopted on a wider scale.

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Analysis of residential program

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DATOC has been requested to analyze CDFA's program activities combating HLB in Southern California for efficiency and effectiveness.

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Situational monitoring

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DATOC provides ongoing monitoring of HLB epidemiology in CA.

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Evaluation of early detection technologies: concluding report

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DATOC was requested to provide a report summarizing research done on Early Detection Technologies which was funded by the Citrus Research Board and HLB-MAC. The report is to include explanations of each technology, economic concerns, diagnostic accuracy, and more.

Final report (if available):

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