Untitled - International Rice Research Institute

Other fungi detected on rice seeds
Other fungi are detected on rice seeds from different countries. Some, such as Nakataea sigmoidea, the
conidial state of Sclerotium rolfsii, cause stem rot, which is important in specific ecosystems. However, most
of these “other fungi” are not known to cause diseases of economic importance. These fungi are listed in
Table 5 and photomicrographs of their habit and microscopic characters are shown.
Table 5. List of other fungi detected on rice seeds.
Fungi Incidence a
Acremoniella atra +
Acremoniella verrucosa +
Alternaria longissima ++
A. tenuissima +
Aspergillus clavatus +
A. flavus-oryzae ++
A. niger ++
Chaetomium globosum +
Cladosporium sp. ++
Curvularia eragrostidis +
Drechslera hawaiiensis +
Epicoccum purpurascens +
Fusarium avenaceum +
F. equiseti +
F. larvarum +
F. nivale +
F. semitectum +++
Gilmaniella humicola +
Memnoniella sp. +
Microascus cirrosus +
Monodictys putredinis +
Myrothecium sp. +
Nakataea sigmoidea ++
Nectria heamatococca +
Papularia sphaerosperma +
Penicillium sp. ++
Pestalotia sp. +
Phaeoseptoria sp. +
Phaeotrichoconis crotolariae +
Pithomyces sp. ++
Pyrenochaeta sp. +
Rhizopus sp. ++
Septogloeum sp. +
Sordaria fimicola +
Spinulospora pucciniiphila +
Sterigmatobotrys macrocarpa +
Taeniolina sp. +
Tetraploa aristata +
Trichoderma sp. +
Trichothecium sp. +
Tritirachium sp. +
Ulocladium botrytis +
a
+ = low, ++ = moderate, +++ = frequent.
57