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
Negros fruit dove "feather," and "pous", "foot." The specific name "arcanus" comes from the Latin word "arcānus" "secret." Some authors have suggested that the specimen was either a runt of either the yellow-breasted fruit dove or a "Treron" pigeon, or a hybrid instead of a unique species; however, these views are generally considered invalid due in part to the distinctiveness of the specimen, particularly in the bare skin around the eye, and no proper evidence has suggested that the Negros fruit dove is an invalid species. It is uncertain where the dove should be placed within the genus "Ptilinopus" as the male's plumage,