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Two new
records of powdery mildews with their effectiveness on three
ornamentals in Turkey
Hamit Kavak
Plant
Protection Department, Agricultural Faculty, University of
Harran 633192 Şanliurfa/Turkey. E-mail:
hkavak@harran.edu.tr. Tel: 904143440072. Fax:
904143183882.
Accepted 18 January, 2011 |
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In this study, two new species of powdery mildews together
with disease severities measured at four different growing
stages were identified on three ornamental species in the
Şanliurfa district of Turkey. Observations and measurements
were made on natural and experimental stands. On natural
stands, 15, 85 and 100% disease rates were determined on
Fuchsia regia, Calendula
officinalis and
Zinnia elegans, respectively. Powdery mildews of
C. officinalis and Z. elegans were
identified as Podosphaera xanthii
(Oidium subgenus Fibroidium). Disease
symptoms were observed from early seedling to late maturing
stages on Z. elegans, and from pre flowering to
maturing stages on C. officinalis.
The mildew pathogen of Fuchsia regia was
identified as Leveillula taurica. This ornamental
species appear to be resistant to this respected powdery
mildew agent during summer, but somewhat susceptible in the
early autumn. In addition, upper leaves were observed the
only section displaying the disease.
Key words:
Podosphaera xanthii,
Leveillula taurica, ornamentals, disease severity. |
