The Citrus Clonal Protection Program (CCPP)
The California Citrus Clonal Protection Program (CCPP) has its roots in the 1930s when the original discovery of the viral nature of the graft-transmissible disease citrus psorosis by Dr. H. Fawcett at the University of California Citrus Experiment Station in Riverside triggered the establishment of the “Psorosis Free Program.” Today CCPP stands as a cooperative program between the University of California Riverside (UCR, Department of Plant Pathology & Microbiology), the California Department of Food and Agriculture (CDFA), the United States Department of Agriculture’s Animal and Plant Health Inspection Service (USDA-APHIS), and the citrus industry of the state of California represented by the California Citrus Nursery Board (CCNB) and the Citrus Research Board (CRB).
The purpose of the CCPP is to provide a safe mechanism for the introduction into California of citrus varieties from any citrus-growing area of the world for research, variety improvement, or for use by the commercial industry of the state. The introduction mechanism includes disease diagnosis and pathogen elimination followed by maintenance and distribution of true-to-type primary citrus propagative material of the commercially important scion and rootstock varieties.
The CCPP operates 3 different facilities;
Rubidoux Quarantine Facility (RQF), Riverside, CA
This facility contains a quarantine glasshouse (5,000 sq. ft.) and a screenhouse (9,000 sq. ft.) to perform biological indexing and maintenance of citrus germplasm, respectively, a modular office and lab area. The original structures were built in 1959-1962 and were fully renovated in 2010-2012.
The Facility also houses the Delfino Family Plant Laboratory (750 sq. ft.) for citrus therapy and diagnostics which was constructed in 2010-2011.
Propagation are made on rough lemon rootstocks to preserve the budline and produce budwood for future index and/or therapy.The CCPP employs two methods of therapy, thermaltherapy and shoot-tip micrografting.
Following therapy procedures, all propagations produced in thearpy will undergo biological indexing again to determine disease status. Disease diagnostics takes place in insct-proof greenhouse with temperature and light controls required for biological indexing.
2.) CCPP- CDRL
CCPP- Citrus Diagnostic & Research Laboratory (CDRL), UC Riverside campus
Testing of citrus nursery stock & trees in a robust, high throughput diagnostic laboratory, requires the identification & characterization of citrus pathogens via high throughput sequencing and constantly developing novel diagnostic tools.
CCPP-Lindcove Foundation Facility (LFF), lindcove Research & Extension Center (LREC)
Foundation & Evaluation Block at Exeter, CA. Facility for trueness-to-type evaluation & budwood distribution to the industry, scientists, & citrus enthusiasts in California & around the world. Its a Foundation and Evaluation Block Facility that consists of an evaluation block of approximately 25 acres that contains over 1,300 trees representing over 300 different scion and rootstock varieties, a protected foundation blocks with approximately 76,000 square feet of protective structures (screen and green houses) containing 1,000 trees that represent over 350 scion and rootstock varieties and a citrus fruit evaluation laboratory.