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
June 23, 2021
Request for Proposals (RFP) – Technical Consultant
The Citrus Research Board is accepting proposals for a Technical Consultant. Click here for more information.
May 17, 2021
Citrus Research Board Debuts Revamped Brand Identity
The Citrus Research Board (CRB) has just updated its brand identity with a revamped logo and an expanded, user-friendly website.
May 7, 2021
Citrus Research Board to Hold 2021 Board Nominations
The Citrus Research Board (CRB) will hold the 2021 Board Nominations on Thursday, September 16, 2021, for Districts 1 and 2. Due to COVID-19 California State public health directives, these meetings will be held online via videoconference and by teleconference. There will be no physical locations for attendees.