TY - JOUR
T1 - Epidemiology of flavescence dorée in vineyards in north-western Italy
AU - Morone, C.
AU - Boveri, M.
AU - Giosue', Simona
AU - Gotta, P.
AU - Rossi, Vittorio
AU - Scapin, I.
AU - Marzachi, C.
PY - 2007
Y1 - 2007
N2 - A serious outbreak of flavescence dorée (FD) was reported in
Piemonte, northwestern Italy, in 1998, and since then, the disease has
compromised the economy of this traditional wine-growing area, even
following the application of compulsory insecticide treatments to control
Scaphoideus titanus, the vector of the causal phytoplasma. Affected vines
show severe symptoms, varying according to the cultivar, and are rogued
to reduce disease spread. Following winter and pruning, a previously
affected vine may appear symptomless and free of phytoplasmas in its
aerial as well as its root system, even by nested-polymerase chain reaction
assays. Such plants are considered to be “recovered”. Since 1998
homogenous data on the incidence of newly infected, healthy, or recovered
plants productivity, presence of vectors, and treatment schedules
have been collected in seven severely affected vineyards of southern
Piemonte for 5 years (1999 to 2003). Infectivity and recovery rates were
also calculated each year. From 1999 to 2003, the average number of
healthy plants decreased and the numbers of recovered plants and those
with symptoms increased. Productivity of recovered vines, although
lower than that of healthy ones, was always higher than that of vines with
symptoms and was not influenced by the time elapsed from date of recovery.
The relationships between the ln-transformed number of vectors
trapped in the vineyards the previous year and the infection and the recovery
rates were fitted by an exponential (R2 = 0.95) and an asymptotic
(R2 = 0.93) model, respectively.
AB - A serious outbreak of flavescence dorée (FD) was reported in
Piemonte, northwestern Italy, in 1998, and since then, the disease has
compromised the economy of this traditional wine-growing area, even
following the application of compulsory insecticide treatments to control
Scaphoideus titanus, the vector of the causal phytoplasma. Affected vines
show severe symptoms, varying according to the cultivar, and are rogued
to reduce disease spread. Following winter and pruning, a previously
affected vine may appear symptomless and free of phytoplasmas in its
aerial as well as its root system, even by nested-polymerase chain reaction
assays. Such plants are considered to be “recovered”. Since 1998
homogenous data on the incidence of newly infected, healthy, or recovered
plants productivity, presence of vectors, and treatment schedules
have been collected in seven severely affected vineyards of southern
Piemonte for 5 years (1999 to 2003). Infectivity and recovery rates were
also calculated each year. From 1999 to 2003, the average number of
healthy plants decreased and the numbers of recovered plants and those
with symptoms increased. Productivity of recovered vines, although
lower than that of healthy ones, was always higher than that of vines with
symptoms and was not influenced by the time elapsed from date of recovery.
The relationships between the ln-transformed number of vectors
trapped in the vineyards the previous year and the infection and the recovery
rates were fitted by an exponential (R2 = 0.95) and an asymptotic
(R2 = 0.93) model, respectively.
KW - Scaphoideus titanus
KW - grapevine
KW - phytoplasma
KW - Scaphoideus titanus
KW - grapevine
KW - phytoplasma
UR - http://hdl.handle.net/10807/37855
U2 - 10.1094/PHYTO-97-11-1422
DO - 10.1094/PHYTO-97-11-1422
M3 - Article
SN - 0031-949X
VL - 2007
SP - 1422
EP - 1427
JO - Phytopathology
JF - Phytopathology
ER -