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
Plum cake puddings are made "were always raisins, not the plump juicy fruits that the name suggests today." In Old English, the term "plūme" was "from medieval Latin "pruna", from Latin "prunum"," which equated to "prune". "Prune" in modern French means plum, so plum tarts have names such as "tarte aux prunes". In English, prunes are dried plums, and when modern cakes use them as a primary ingredient, they may be referred to as a plum cake or type of plum cake. Plum cake has historically referred to an early type and style of fruitcake in England since around 1700. Raisins and