Chrysanthemum stem necrosis possibly due to a new tospovirus
In Brazil, in several commercial crops of the county of Atibaia (São Paulo State), chrysanthemum plants were found with necrotic lesions surrounded by yellow areas on leaves. Lesions are followed by necrosis on stems, peduncles and floral receptacles. Serious damage has been reported, especially in the cv. Polaris. Host range, in vitro properties and particle morphology of the causal virus were typical of a tospovirus. The authors have demonstrated that this virus is serologically different from other tospoviruses (tomato spotted wilt, tomato chlorotic spot, groundnut ringspot and impatiens necrotic spot tospoviruses). They concluded that this pathogen may be a new serogroup of tomato spotted wilt tospovirus (potential EPPO A2 quarantine pest) or a new virus.
Sources
Duarte, L.M.L.; Rivas, E.B.; Alexandre, M.A.V.; De Avila, A.C.; Nagata, T.; Chagas, C.M. (1995) Chrysanthemum stem necrosis caused by a possible novel tospovirus.
Journal of Phytopathology 143(9), 569-571.