Florida Growers Order 300,000 Gene-Edited Trees to Fight Citrus Greening
21 September 2026, Florida, United States: Florida citrus growers have ordered more than 300,000 trees of CarriCea T1, a CRISPR gene-edited rootstock
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Citrus Greening Resistance
Get the latest Citrus Greening Resistance news, research and developments covering efforts to develop citrus varieties and rootstocks that can better withstand Huanglongbing (HLB), one of the most serious diseases affecting citrus production worldwide. This tag brings together developments in citrus breeding, genetics, gene editing, rootstock research, field trials and other approaches aimed at improving tree health and long-term orchard productivity.
Research is focusing on identifying HLB-tolerant and resistant genetic material, understanding resistance-associated genes and developing improved commercial cultivars. USDA research programmes are evaluating resistant and tolerant citrus selections, while genetic studies are identifying QTLs and other markers associated with the plant’s response to Candidatus Liberibacter asiaticus. Gene-editing programmes are also investigating potential resistance traits. In 2026, USDA APHIS deregulated SoilCea’s genetically engineered CarriCea Carrizo rootstock, developed for resistance to citrus greening, while University of Florida research supported development of HLB-resistant rootstock technology.
Find updates on HLB-resistant citrus varieties, rootstocks, citrus breeding, CRISPR research, disease-tolerance genes, genetic mapping, field evaluations and commercialisation. Coverage includes research institutions, breeding programmes, biotechnology companies and grower initiatives working to address citrus greening, with developments spanning oranges, mandarins, grapefruit and other commercially important citrus crops.