The genus Canna is susceptible to certain plantviruses, which may result in spotted or streaked leaves, in a mild form, but can finally result in stunted growth and twisted and distorted blooms and foliage. Known species of virus are This method of division can spread viral diseases, resulting in decline in clonal vigor.Fisher, J, Sanchez-Cuevas, M-C, Nameth, S and Woods, V (1997) First report of cucumber mosaicvirus in Eryngium amethystinum, Canna spp., and Aquilegia hybrids in Ohio. Plant Dis., 81, 1331. AJ297628). Pathogenicity test showed SCMV-canna could cause typical symptoms of mosaic and necrosis in some tested plants with varying levels of severity but was less virulent than the isolate SCMV-BJ. Field survey showed that the virus was widely distributed. Cannas can be infected by one or more of Canna yellow mottle virus (CaYMV), Bean yellow mosaicvirus (BYMV) and Canna yellow streak virus (CaYSV). Plantviruses are the most serious problem affecting cannas in the UK, causing stunted growth, severe streaking... To survey the epidemiology of this virus in canna, 64 cannaplants with mosaic symptom originating from different districts of Beijing were assayed using RT-PCR detection with a primer pair (Additional file 3: Table S1) targeting the CP gene. Field survey showed that the virus was widely distributed. Conclusions: This study identified SCMV as the major agent causing the prevalent mosaic symptom in cannaplants in Beijing and its genomic and biological characterizations were further explored. Bean yellow mosaicvirus (BYMV), Canna yellow streak virus (CaYSV), and Canna yellow mottle virus (CaYMV) are problematic viruses infecting cannas.This study investigated if rhizome planting stocks can be a source of virus infection. The plant is susceptible to leaf-rolling caterpillars. Cannamosaicvirus causes pale yellow stripes on the leaves. Leaf spot, rust, and bacterial blight may be also be found. The rhizomes will rot in poorly drained soils. The diseased plants showed severe mosaic and veinal streaking on the leaves. Four canna cultivars, Black Knight, Golden Yellow Lucifer, Flaccida and Pink Rose, were affected. The symptoms observed were typical viral symptoms. Mosaicvirus in cannas is usually spread by aphids . It can also be spread by the propagation of already infected plant material. If one plant is both infected with mosaicvirus and infested with aphids, the chances of the disease spreading to nearby plants is very high. Cucumber MosaicVirus: The Unknown Viruson Bedding Plants. and Perennials. By Dr. S.G.P. Nameth Department of Plant Pathology. The Ohio State University.Cucumber MosaicVirus. Figure 1. Leaf mosaiconCanna Lily caused by CMV. The first sequence obtained from a Potyvirus infecting Cannaplants (Canna spp.) revealed that it is a new strain of Bean yellow mosaicvirus (BYMV), without noticeable recombination with other plant RNA viruses from this region being found. Keywords: plantviruses and viroids, chrysanthemum, garden and essential oil rose, clematis, canna, lavender.Canna is predominantly propagated by rhizome dividing, which, in combination with a wide international market of planting stock, promotes the rapid spread of viral diseases.
