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
Fruit butter sugar are often added, as are spices. Fruit butter or paste can have a texture similar to dairy butter. Fruit butter A fruit butter is a sweet spread made of fruit cooked to a paste, then lightly sweetened. It falls into the same category as jelly and jam. Apple butter and plum butter are common examples. Fruit pastes, popular in Latin American countries, are similar but more highly sweetened and jelled. They are sold in shallow tins or as wrapped bricks, while fruit butters usually come in wide-mouthed jars. In order to make fruit butter, the fruit is cooked on