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Title: TWO DIFFERENT PHYTOPLASMAS BELONGING TO GROUP 16SRV MAY OCCUR IN GRAPEVINESAFFECTED BY FLAVESCENCE DOREE DISEASE

Author
item BIANCO, P - MILANO ITALY
item CASATI, P - MILANO ITALY
item Davis, Robert
item SCATTINI, G - MILANO ITALY

Submitted to: International Organization for Mycoplasmology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 7/30/1996
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The grapevine yellows disease known as Flavescence doree (FD) has been reported in France (Caudwell, 1957) and in northern Italy (Belli et al, 1973). In Veneto region (north Italy) the disease has been found predominantly associated with phytoplasmas belonging to group 16SrV (elm yellows and related phytoplasmas) (Bianco et al 1993). Previous work revealed the association of phytoplasmas in a groups 1SrI (aster yellows and related phytoplasmas), 16SrV, and 16SrIII (X-disease and related phytoplasmas) with grapevine yellows syndromes in different regions and identified a presumed agent of Flavescence doree (sensu stricto, Daire et al., 1992) as a member of the elm yellows phytoplasma group (Prince et al., 1993). Other work reported that Stolbur phytoplasmas were associated with grapevine yellows in Germany (Maixner et al. 1995). Our investigations were carried on in order to investigate the presence and the distribution of the phytoplasmas involved in the diseases. Samples from naturally diseased grapevines exhibiting symptoms typical of FD and from symptomless grapevines were collected, the beginning of September, in the provinces of Vicenza (north Italy), where Scaphoideus titanus is present, and Arezzo province (central Italy), where the vector of FD is not present. In addition, leaf samples from plants of Rubus fruticosa, field collected in Pavia province (north Italy) and Ulmus campestris, field collected in Vicenza province, showing symptoms of witches' broom disease were included in our experiments.