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
Smoked plum Unripe plums are picked in early summer, smoked, and dried at . In China, smoked plums are used to make "suānméitāng", a sour plum drink. In Korea, smoked plums are used to make traditional teas and drinks such as "omae-cha" (smoked plum tea) and "jeho-tang" (medicinal summer drink). Latin (pharmaceutical) name for smoked plums is Mume Fructus. In Traditional Korean medicine, smoked plums are considered conductant for the liver channel, spleen channel, lung channel, and large intestine channel. It is used to treat ascariasis, vomiting, cough, and diarrhea. It is reported to relieve phlegm, inhibit intestinal motility, and fight bacteria