Genus Cercospora in Thailand: Taxonomy and Phylogeny (with a ...

Plant Pathology & Quarantine
Fig. 27 – Line drawings of Cercospora nilghirensis on Conyza sumatrensis. a. Conidia. b.
Conidiophores and stromata. Bars: a = 25 µm, b = 50 µm. (Meeboon 2009).
and Iman Hidayat (BBH 23570); cv. ice berg,
Jamjan Meeboon and Iman Hidayat (BBH
23633); cv. lettuce green oak leaf, Jamjan
Meeboon and Iman Hidayat (BBH 23597); and
cv. lettuce sweet chart, Jamjan Meeboon and
Iman Hidayat (BBH 23631)
Hosts – Cichorium endivia, C. intybus L.,
Lactuca chinensis, L. denticulata, L. indica, L.
paradoxa, L. saligna, L. scariola, and L. sativa
(Asteraceae) (Crous & Braun 2003, Meeboon
et al. 2007c).
Distribution – Worldwide, wherever the
host is grow, including China, Japan, Korea,
Taiwan, Thailand (Crous & Braun 2003,
Meeboon et al. 2007c).
Notes – The first report of this species
from Thailand was made by Meeboon et al.
(2007c). The first report of C. lactucae-sativae
infecting Cichorium endivia, and various
cultivars of L. sativa, viz, cv. butter head
lettuce, cv. red leaf lettuce, cv. green corol, cv.
red corol, cv. red oak leaf, cv. ice berg, cv.
lettuce green oak leaf, and cv. lettuce sweet
chart, in Thailand was by Meeboon (2009).
Cercospora nilghirensis Govindu & Thirum.,
Sydowia 9: 224 (1955). Fig. 27
Leaf spots 2–5 mm diam., amphigenous,
distinct, circular to subcircular, pale to whitish
at the center with dark margin. Caespituli
amphigenous. Stromata up to 12 μm diam.,
small, often lacking, intraepidermal, composed
of a few globose to subglobose, brown cells.
Conidiophores 88–118 × 4–6 μm, 4–9 in loose
to dense fascicles, 2–5-septate, arising from
stromata, straight to decumbent, smooth, brown
at the base, paler toward the apex, unbranched,
cylindrical, geniculate, mostly near the apex.
Conidiogenous cells integrated, terminal or
intercalary, frequently monoblastic, sometimes
polyblastic, sympodially proliferating. Conidiogenous
loci 2–2.5 μm diam., conspicuous
thickened and darkened. Conidia 40–96 × 3.5–
45