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 In certain parts of the world, some fruits are called plums and are quite different from fruits known as plums in Europe or the Americas. For example, marian plums are popular in Thailand, Malaysia and Indonesia, otherwise also known as "gandaria", "plum mango", "ma-praang", "ma-yong", "ramania", "kundang", "rembunia" or "setar". Another example is the loquat, also known as Japanese plum and Japanese medlar, as well as "nispero", "bibassier" and "wollmispel" elsewhere. In South Asia and Southeast Asia, jambul, a fruit from tropical tree in Myrtaceae family, is similarly sometimes referred to 'damson plums', and it is different from damson plums