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
Date-plum genus. Its English name probably derives from Persian "Khormaloo" خرمالو literally "date-plum", referring to the taste of this fruit which is reminiscent of both plums and dates. This species is one candidate for the "lotus tree" mentioned in "The Odyssey": it was so delicious that those who ate it forgot about returning home and wanted to stay and eat lotus with the lotus-eaters. The tree grows in the lower and middle mountain zones in the Caucasus. They usually grow up to 600 m above sea level. In Central Asia, it rises higher—up to 2000 m. They rarely grow in stands