The Citrus Clonal Protection Program (CCPP) was established more than 50 years ago under the name Citrus Variety Improvement Program. Today, it stands as a cooperative program between the Citrus Research Board (CRB) and the University of California, Riverside (UCR), California Department of Food and Agriculture (CDFA), United States Department of Agriculture-Animal and Plant Health Inspection Service and the California Citrus Nursery Board (CCNB). The CCPP has been a core program of the CRB since the establishment of the marketing order in 1968. As such, the CRB has been the primary funding agency for day-to-day CCPP activities. Since 2009, the CCPP has been a part of the National Clean Plant Network (NCPN) for specialty crops. USDA-NCPN funding has supplemented CCPP activities in the past few years, providing funding for facilities and equipment upgrades. The CDFA and the CCNB have been providing CCPP with funding to execute the citrus nursery registration program for budwood and seed tree sources. UCR supports CCPP with infrastructure, facilities and all related indirect costs.
Seeking a better and brighter future through research
Core Research Programs
Citrus Clonal Protection Program
The Citrus Clonal Protection Program (CCPP) was established more than 50 years ago under the name Citrus Variety Improvement Program... Read More
Integrated Pest Management (IPM)
The goal of the Integrated Pest Management (IPM) core program is to conduct research to provide California citrus growers with a ‘state of the art’... Read More
The aim of the integrated breeding core program is to develop or identify and evaluate new citrus scion and rootstock cultivars suitable for California... Read More
Browse Current Research ProjectsSearch The Research Database
Building a genomic toolkit to protect the navel orange
Navel oranges are the most widely grown citrus type in California. Because they are seedless, navel oranges cannot be improved with conventional breeding. As a result, this variety is particularly vulnerable to the introduction of new pests and pathogens.
Reducing Disease Risk by Discovery, Introduction and Commercialization of New Citrus Varieties
Citrus varieties that are unavailable from the CCPP exist in California and elsewhere that hobbyists would like to grow in California. With the presence of the Asian citrus psyllid and HLB in California, such varieties represent a severe threat to citrus in California because hobbyists may propagate them using diseased budwood.
Engineering Citrus using recent advances in gene editing technologies
We propose to develop a streamlined strategy for effective gene editing of Citrus in order to engineer disease resistance in already established horticulturally important cultivars. Building on our prior work, we will develop a suite of methods aimed at rapidly and efficiently editing genes involved in HLB susceptibility.
News & EventsAll News & Events
May 27, 2022
2022 CRB Webinar Series Begins June 7
The Citrus Research Board (CRB) is excited to announce the return of the CRB Webinar Series geared toward citrus growers and industry professionals. CRB will be holding four one-hour webinars scheduled for June 2022. Each webinar will highlight a specific CRB-funded research area and provide technical insight for growers.
April 21, 2022
CA-CRaFT Program Update
Keep an eye out for grower applications, available soon for the California Citrus Research and Field Trials (CA-CRaFT) project.
February 17, 2022
CRB Request for Research Proposals Available for the 2022-23 Fiscal Year
The Citrus Research Board (CRB) is pleased to announce the release of its Request for Proposals (RFP) for the 2022-23 fiscal year.