First report of Chrysanthemum stem necrosis virus in Japan
In Japan, chrysanthemum for cut flower production (Dendranthema grandiflorum) is the most important ornamental crop and is grown over more than 6,000 ha. In August 2006, necrotic streaks on stems, leaf distortions, chlorotic and necrotic spots and rings on leaves were observed on D. grandiflorum cvs ‘Jimba’ and ‘Seinotama’. The disease was observed on the premises of 1 grower in Hiroshima Prefecture (Honshu) and its incidence reached 70% (approximately 30,000 plants covering 1,000 m² of glasshouses). Frankliniella occidentalis (Thysanoptera: Thripidae – EPPO A2 List) was the main thrips species found in association with diseased plants, followed by F. intosa. Laboratory assays (serology, PCR) and pathogenicity tests confirmed the presence of Chrysanthemum stem necrosis virus (Tospovirus, CSNV – EPPO A2 List) in symptomatic chrysanthemums. This is the first report of CSNV in Japan.
The situation of Chrysanthemum stem necrosis virus in Japan can be described as follows: Present, first reported in 2007 in 1 production site in Hiroshima Prefecture (Honshu).
Matsuura S, Kubota K, Okuda M (2007) First report of Chrysanthemum stem necrosis virus on chrysanthemums in Japan. Plant Disease 91(4), p 468.