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
Sugar plum Sugar plum A sugar plum is a piece of dragée or hard candy made of hardened sugar in a small round or oval shape. "Plum" in the name of this confection does not mean plum in the sense of the fruit of the same name, but referred to small size and spherical or oval shape. Traditional sugar plums contained no fruit, but were instead hardened sugar balls. These hardened sugar balls were comfits, and often surrounded a seed, nut, or spice. The term sugar plum came into general usage in the 17th century. At that time, adding layers of sweet