TY - JOUR
T1 - Effect of Environmental Factors on Mycelial Growth and Conidial Germination of Fusicladium eriobotryae, and the Infection of Loquat Leaves.
AU - González-Domínguez, E.
AU - Rossi, Vittorio
AU - Armengol, J.
AU - García-Jiménez, J.
PY - 2013
Y1 - 2013
N2 - In Spain, loquat scab, caused by Fusicladium eriobotryae, is usually
controlled by fungicides when there are favorable conditions for infection.
Lacking specific data on the effect of weather conditions on infection
by F. eriobotryae, infection periods are predicted based on the
Mills table for apple scab. Experiments were conducted to determine
the influence of temperature, wetness duration, relative humidity (RH),
and dry periods on mycelial growth, conidial germination, and infection
of loquat leaves by F. eriobotryae. F. eriobotryae was able to grow
and the conidia to germinate in a wide range of temperatures, whereas
no germination occurred at RH < 100%. Maximum conidial germination
occurred with 24 h of wetness and germination was strongly reduced
by >10 h of dryness interrupting the wetness period. Loquat
infection occurred between 10 and 20°C, and disease incidence and
severity increased as the duration of wetness period increased. The
combined effect of temperature and wetness duration on conidial
germination of F. eriobotryae and infection of leaves was described by
combining β and Gompertz equations, while the effect of dry periods
on reducing the conidial germination was described by a logarithmic
equation. The equations developed in this work provided a reasonable
fit of the biological processes investigated and could be used for better
disease control; they could be further integrated in a disease prediction
system for scheduling fungicide sprays against loquat scab.
AB - In Spain, loquat scab, caused by Fusicladium eriobotryae, is usually
controlled by fungicides when there are favorable conditions for infection.
Lacking specific data on the effect of weather conditions on infection
by F. eriobotryae, infection periods are predicted based on the
Mills table for apple scab. Experiments were conducted to determine
the influence of temperature, wetness duration, relative humidity (RH),
and dry periods on mycelial growth, conidial germination, and infection
of loquat leaves by F. eriobotryae. F. eriobotryae was able to grow
and the conidia to germinate in a wide range of temperatures, whereas
no germination occurred at RH < 100%. Maximum conidial germination
occurred with 24 h of wetness and germination was strongly reduced
by >10 h of dryness interrupting the wetness period. Loquat
infection occurred between 10 and 20°C, and disease incidence and
severity increased as the duration of wetness period increased. The
combined effect of temperature and wetness duration on conidial
germination of F. eriobotryae and infection of leaves was described by
combining β and Gompertz equations, while the effect of dry periods
on reducing the conidial germination was described by a logarithmic
equation. The equations developed in this work provided a reasonable
fit of the biological processes investigated and could be used for better
disease control; they could be further integrated in a disease prediction
system for scheduling fungicide sprays against loquat scab.
KW - Environmental factors
KW - Fusicladium eriiobotryae
KW - Loquat scab
KW - Environmental factors
KW - Fusicladium eriiobotryae
KW - Loquat scab
UR - http://hdl.handle.net/10807/46814
U2 - 10.1094/PDIS-02-13-0131-RE
DO - 10.1094/PDIS-02-13-0131-RE
M3 - Article
SN - 0191-2917
VL - 2013
SP - 1331
EP - 1338
JO - Plant Disease
JF - Plant Disease
ER -