parent_taxon prune dwarf virus
___MASK11___ propagation is the process of creating new plants from a variety of sources : seeds , cuttings , bulbs and other ___MASK11___ parts . ___MASK11___ propagation can also refer to the artificial or natural dispersal of plants . A rose is a woody perennial flowering ___MASK11___ of the genus ___MASK9___ , in the family ___MASK81___ , or the flower it bears . There are over a hundred species and thousands of cultivars . They form a group of plants that can be erect shrubs , climbing or trailing with stems that are often armed with sharp prickles . Flowers vary in size and shape and are usually large and showy , in colours ranging from white through yellows and reds . Most species are native to Asia , with smaller numbers native to Europe , North America , and northwestern Africa . Species , cultivars and hybrids are all widely grown for their beauty and often are fragrant . Roses have acquired cultural significance in many societies . Rose plants range in size from compact , miniature roses , to climbers that can reach seven meters in height . Different species hybridize easily , and this has been used in the development of the wide range of garden roses . Prune dwarf ___MASK45___ ( PDV ) is a plant pathogenic ___MASK45___ of the family ___MASK66___ . It causes dwarfism of leaves on certain prune and plum plants . It will also cause yellows in sour cherry , especially when present with ___MASK99___ necrotic ringspot ___MASK45___ . There are no known transmission vectors , though the pollen of infected cherry trees has been found to infect other cherry trees a small percent of the time . ___MASK99___ is a genus of trees and shrubs , which includes the plums , cherries , peaches , nectarines , apricots and almonds . ___MASK66___ is a family of viruses . Plants serve as natural hosts . There are currently 33 species in this family , divided among 6 genera . " ___MASK99___ necrotic ringspot virus " ( PNRSV ) is a plant pathogenic virus causing ring spot diseases affecting species of the genus " ___MASK99___ ", as well as other species such as rose (" Rosa " spp .) and hops (" Humulus lupulus "). PNRSV is found worldwide due to easy transmission through plant propagation methods and infected seed . The virus is in the family " Bromoviridae " and genus " ___MASK44___ ". Synonyms of PNRSV include European plum line pattern virus , hop B virus , hop C virus , plum line pattern virus , sour cherry necrotic ringspot virus , and peach ringspot virus . ___MASK44___ is a genus of viruses , in the family Bromoviridae . Plants serve as natural hosts . There are currently 19 species in this genus including the type species Tobacco streak virus .