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 leavened with yeast. In New England, large election cakes weighing around would traditionally be served while people waited for election results. It has been stated that the first published election cake recipe appeared in 1796 in "American Cookery". Plum cake recipes in the fruitcake style appeared in early cookbooks in the Southern United States, and did not actually call for plums. After 1830 plum cake was often referred to as fruit cake or black cake. In 1885, in a description of plum cake that sounds like plum pudding, it was described as "mucilaginous" - a solid, dark-colored, thick cake with