Our Research

Assessing Impact MCA13-Reactive Citrus tristeza virus isolates in TCPCD orchards

Project ID:


Principal Investigator:

Raymond Yokomi

Principal Investigator Affiliation:

United States Department of Agriculture - Agricultural Research Service




  • Subhas Hajeri

Start Date:


Estimated Duration:

6 year(s)

Completed Date:


Annual Funding:


As part of CDFA’s CTV Interior Quarantine, the CCTEA uses the strain-discriminating CTV monoclonal antibody, MCA13, to test for potential virulent CTV isolates. However, some MCA13-reactive isolates in California (RB or S1 genotypes) were found to have mild disease phenotypes by virus indexing. This project was initiated in 2015 for a 3-year period to determine the impact of MCA13 positive CTV isolates may have in local commercial citrus plantings. We are asking for a fourth year to complete the project. This extension includes a request from the TCPCDB to evaluate LREC CTV isolates that increased in numbers from 20 in 2017 to 61 in 2018.

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