Japanese Fungi on Plants No.12 before next top

Blumeria graminis (DC.) Speer [Erysiphe graminis DC.]
Classification: Ascomycota, Pyrenomycetes, Erysiphales, Erysiphaceae

 Widely distributed in Japan and causing powdery mildew in gramineous plants. Infects various crops, barley, wheat and etc. in addition to gramineous weeds, rescuegrass, wheatgrass, etc. Parasitic specialized strains are differentited for each plant and grouped as formae specialis (f. sp.). Produces ascocarps and conidia on leaves and absorbing nutrition by haustoria in leaf tissue cells. Disperses by scattering conidia and ascospores. Never grow on synthetic media.

Characteristics: Plant pathogen   Symptom: JPEG (Ryegrass, Powdery mildew, 54kb)

 Teleomorph: Ascocarp blackish brown, globose with with filamentous appendages, producing oblong asci inside. Ascospores hyaline, ellipsoid, 20-30 x 10-13 um insize.
 Anamorph: On hyaline conidiophores, producing catenate conidia of hyaline, oblong to cylindrical, not including fibrosin bodies, 32-44 x 12-15 um in size. Haustoria palmate.
Conidia haustorium (staining)

Herbarium specimen in NIAES

Specimen No. Scientific name Host name Host scientific name Symptoms Geographical origin Collected date Collector
103-2-7 Blumeria graminis f.sp. hordei Barley Hordeum vulgare Powdery mildew Fukuoka  1937 Kawamura, E.
103-1-13 Blumeria graminis Wheat Triticum aestivum " Nishigahara, Tokyo  1942.5.23 Ozoe, S.
103-1-14 " " " " Hatano, Kanagawa 1942.6.9

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

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