Heidi Ledford, Nature News, 16 May 2017, https://www.nature.com/news/geneticists-enlist-engineered-virus-and-crispr-to-battle-citrus-disease-1.21997
American Citrus farmers are facing two threats to their crops, the citrus tristeza virus and citrus greening. Citrus greening is the result of a bacterial infection that causes bitter, misshapen fruits with green lower halves. To stop the spread of citrus greening, scientists are attempting to use CRISPR/Cas to modify the citrus trees for increased resistance. Local growers have even helped fund a project to sequence the citrus trees to help identify potential targets.