Ruscus racemosus (Danae racemosa) is an ornamental species with decorative foliage of which branches are commercially sold to be used in flower arrangements. In the Ligurian Riviera this shrub is cultivated in 330 ha and the cut foliage produced is almost all exported to Europe and the United States. In 2005-‘06, several inspections carried out in R. racemosus crops of Sanremo area, revealed different severe leaf symptoms consisting on: concentring yellow and necrotic rings, necrotic spots (from a few mm to c.a. 1 cm in size), necrosis and bronzing of the lamina. In 2005, the percentage in the open fields of diseased plants showing necrotic rings was about 60-70%; similar percentages of symptomatic plants were also observed in 2006. Preliminary electron microscope observations (“leaf dip” method) did not reveal the presence of filamentous virus particles. Considering that, ten years ago Impatiens necrotic spot virus (INSV) was found infecting D. racemosa in Portugal (1), virological tests (DAS and PAS-ELISA, RT-PCR) were applied to verify Tospovirus presence. Tomato spotted wilt virus (TSWV) and INSV singly infected plants showing necrosis and spots; whereas, in mixed infection they were associated to all the other leaf symptoms described, added to a prematurely death of the plant. This survey confirms one time again the great variability of symptoms induced by Tospoviruses in ornamental species and that their spreading in Liguria region is still increasing. (1) D. Louro, 1996. Detection and identification of tomato spotted wilt virus and impatiens necrotic spot virus in Portugal. Acta Horticulturae, 431, 99-105.
M.G. Bellardi, V. Vicchi, A. Benni, P. Restuccia (2007). TOSPOVIRUSES INFECTING RUSCUS RACEMOSUS (DANAE RACEMOSA) IN LIGURIA. PERUGIA : s.n.
TOSPOVIRUSES INFECTING RUSCUS RACEMOSUS (DANAE RACEMOSA) IN LIGURIA
BELLARDI, MARIA GRAZIA;BENNI, ALESSANDRO;
2007
Abstract
Ruscus racemosus (Danae racemosa) is an ornamental species with decorative foliage of which branches are commercially sold to be used in flower arrangements. In the Ligurian Riviera this shrub is cultivated in 330 ha and the cut foliage produced is almost all exported to Europe and the United States. In 2005-‘06, several inspections carried out in R. racemosus crops of Sanremo area, revealed different severe leaf symptoms consisting on: concentring yellow and necrotic rings, necrotic spots (from a few mm to c.a. 1 cm in size), necrosis and bronzing of the lamina. In 2005, the percentage in the open fields of diseased plants showing necrotic rings was about 60-70%; similar percentages of symptomatic plants were also observed in 2006. Preliminary electron microscope observations (“leaf dip” method) did not reveal the presence of filamentous virus particles. Considering that, ten years ago Impatiens necrotic spot virus (INSV) was found infecting D. racemosa in Portugal (1), virological tests (DAS and PAS-ELISA, RT-PCR) were applied to verify Tospovirus presence. Tomato spotted wilt virus (TSWV) and INSV singly infected plants showing necrosis and spots; whereas, in mixed infection they were associated to all the other leaf symptoms described, added to a prematurely death of the plant. This survey confirms one time again the great variability of symptoms induced by Tospoviruses in ornamental species and that their spreading in Liguria region is still increasing. (1) D. Louro, 1996. Detection and identification of tomato spotted wilt virus and impatiens necrotic spot virus in Portugal. Acta Horticulturae, 431, 99-105.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
