Cochliobolus heterostrophus (Japanese Fungi on Plants)

Japanese Fungi on Plants No.21 before next top

Cochliobolus heterostrophus (Drechs.) Drechs. [=Bipolaris maydis (Nisikado) Shoem., Helminthosporium maydis Nisikado]
Classification: Ascomycota, Locuoascomycetes, Dothideales, Pleosporaceae

Distributed widely in Japan. Causes southern corn leaf blight and the damages are very severe. Sometimes isolated from other gramineous plants and weeds. Disperses by scattering conidia. Teleomorph has never been observed in nature.

Characteristics: Plant pathogen Symptom: JPEG (Corn, Southern leaf blight, 54kb)

			Morphology: Teleomorph: Produced by paired culture on artificial media. Producing oblong asci in black pseudothecia. Hyaline and filamentous ascospores of 130-340 x 6-9 um produced in coiled helix in asci. Anamorph: On brown conidiophore, producing conidia usually curved, light brown, fusiform to oblong, 70-160 x 15-20 um, with 5-11 pseudosepta.
Asci and ascospores (after staining)	Conidia	Colony on V8 juice agar

Herbarium specimen in NIAES

Specimen No.	Scientific name	Host name	Host scientific name	Symptoms	Geographical origin	Collected date	Collector
246-1-48	Cochliobolus heterostrophus	Corn	Zea mays	Southern leaf blight	China?	1942.8.22
249-2-1	"	"	"	"	Fujiwara, Tochigi	1961.8.8	Tominaga, T.
249-2-2	"	"	"	"	Nishinasuno, Tochigi	1961.9.20	Komuro, Y.
249-2-3	"	"	"	"	"	"	"
104-1-41	"	"	"
104-1-45	"	"	"	"	Chiba, Chiba	1965.10.27	Tominaga, T.
135-1-12	"		Hemarthria compressa	Leaf blight	Nago, Okinnawa	2000.7.7	Tsukiboshi, T.

(Described by Tsukiboshi, T., NIAES, Microbial Systemtics Lab., 2002)