California scientists use various techniques, including grafting citrus trees under a microscope, to avoid all graft-transmissible diseases when introducing a citrus variety to the state. Because citrus trees are vulnerable to many graft-transmissible diseases, all citrus varieties to be introduced in California must by law go through the Citrus Clonal Protection Program or CCPP at the University of California Riverside. Using a grafting technique called shoot tip grafting, the CCPP will remove any disease-causing organisms and certify that a variety is healthy for release in California.
In California our citrus trees are severely threatened by a deadly and incurable plant disease called huanglongbing or HLB. It is possible to save citrus trees from this disease by removing and destroying unloved citrus trees. A free citrus tree removal service is now available in California's HLB-affected areas.
California scientists are now breeding and growing citrus from seed in order to overcome citrus disease. Scientists have discovered that some Australian native citrus relatives show natural resistance to the deadly huanglongbing (HLB) disease. Crossing these Australian citrus relatives with traditional citrus varieties has the potential to produce hybrid offspring with resistance to HLB.
The below video shows how to set up an account and place an order for citrus budwood from California’s Citrus Clonal Protection Program or CCPP. Citrus budwood is used for grafting citrus trees and budding citrus trees.
By law all new citrus varieties in California are introduced via the CCPP whether from outside the state or from within the state. CCPP scientists use proven techniques to eliminate all diseases from each citrus variety before release. The CCPP budwood program is available for citrus nurseries and hobbyists both inside and outside of California.