TY - JOUR
T1 - Dispersal of conidia of Fusicladium eriobotryae and spatial patterns of scab in loquat orchards in Spain.
AU - González-Domínguez, Elisa
AU - Rossi, Vittorio
AU - Michereff, Sami Jorge
AU - García-Jiménez, José
AU - Armengol, Josep
PY - 2014
Y1 - 2014
N2 - Dispersal of conidia of Fusicladium
eriobotryae, the causal agent of loquat scab, was investigated
in two loquat orchards in Spain from 2010 to
2012. A volumetric spore sampler, horizontally and
vertically orientated microscope slides, and rain collectors
were placed in loquat fields to trap conidia of
F. eriobotryae. No conidia were collected in the volumetric
sampler, and highly variable numbers of conidia
were collected in the rain gatherers. Large numbers of
conidia were collected by microscope slides, particularly
by those held in a horizontal orientation compared
with those held in a vertical orientation. Approximately
90%of the F. eriobotryae conidia were collected during
rainy periods. Based on ROC and Bayesian analysis,
using ≥ 0.2 mm rainfall as a cut-off value resulted in a
high probability of correctly predicting actual conidial
dispersal, and had a low probability of failing to predict
actual conidial dispersal. Based on the index of
dispersion and the binary power law, the incidence of
loquat scab on fruit was highly aggregated in space
between and within trees, and aggregation was influenced
by disease incidence. Our results demonstrate, for
the first time, that F. eriobotryae is dispersed mainly in
rain splash. The results will be integrated into a mechanistic,
weather-driven, disease prediction model that
should help growers to minimize fungicide application
for the management of loquat scab.
AB - Dispersal of conidia of Fusicladium
eriobotryae, the causal agent of loquat scab, was investigated
in two loquat orchards in Spain from 2010 to
2012. A volumetric spore sampler, horizontally and
vertically orientated microscope slides, and rain collectors
were placed in loquat fields to trap conidia of
F. eriobotryae. No conidia were collected in the volumetric
sampler, and highly variable numbers of conidia
were collected in the rain gatherers. Large numbers of
conidia were collected by microscope slides, particularly
by those held in a horizontal orientation compared
with those held in a vertical orientation. Approximately
90%of the F. eriobotryae conidia were collected during
rainy periods. Based on ROC and Bayesian analysis,
using ≥ 0.2 mm rainfall as a cut-off value resulted in a
high probability of correctly predicting actual conidial
dispersal, and had a low probability of failing to predict
actual conidial dispersal. Based on the index of
dispersion and the binary power law, the incidence of
loquat scab on fruit was highly aggregated in space
between and within trees, and aggregation was influenced
by disease incidence. Our results demonstrate, for
the first time, that F. eriobotryae is dispersed mainly in
rain splash. The results will be integrated into a mechanistic,
weather-driven, disease prediction model that
should help growers to minimize fungicide application
for the management of loquat scab.
KW - Eriobotrya japonica
KW - Plant disease epidemiology
KW - Rain splash
KW - Spore traps
KW - Eriobotrya japonica
KW - Plant disease epidemiology
KW - Rain splash
KW - Spore traps
UR - http://hdl.handle.net/10807/58931
U2 - 10.1007/s10658-014-0439-0
DO - 10.1007/s10658-014-0439-0
M3 - Article
SN - 0929-1873
VL - 139
SP - 849
EP - 861
JO - European Journal of Plant Pathology
JF - European Journal of Plant Pathology
ER -