Texas Phoenix palm decline (TPPD) is a new disease in Florida. This disease is caused by an unculturable bacterium that has no cell wall — a phytoplasma. The TPPD phytoplasma is similar to, but genetically distinct from the phytoplasma that causes lethal yellowing (LY) disease of palms. Texas Phoenix palm decline is a fatal, systemic disease that kills palms quickly. The TPPD phytoplasma is spread naturally to palms by sap-feeding insects, such as planthoppers.