Plum pox show no symptoms on leaves or fruit. Not all infection in "Prunus" are characterized by a ring symptom on leaves. Several cultivars show yellowing line patterns and blotches, or necrotic ring symptoms on expanded leaves. Leaf distortion has also been observed. Infected fruit can develop yellow rings or blotches, or brown rings, and some plum and apricot fruit can be severely deformed and bumpy. The seed of many infected apricots and some plums show rings. Many non-"Prunus" species, in at least nine plant families, have been infected artificially with one or more strains of the plum pox virus, and in
Prunus salicina they dominate the stone fruit industry in Western Australia. Prunus salicina Prunus salicina (syn. "Prunus triflora" or "Prunus thibetica"), commonly called the Japanese plum or Chinese plum, is a small deciduous tree native to China. It is now also grown in fruit orchards in Korea, Japan, the United States, and Australia. "Prunus salicina" should not be confused with the "Prunus mume", a related species of plum also grown in China, Japan, Korea and Vietnam. Another tree, "Prunus japonica", is also a separate species despite having a Latin name similar to "Prunus salicina"'s common name. Plant breeder Luther Burbank devoted a