Ustilago avenae (Persoon) Rostrup, 1890

on Arrhenatherum

Ustilago avenae

Arrhenatherum elatius, Niewendam

Ustilago avenae

detail

Ustilago avenae on Arrhenatherum elatius

galled spikelet

Ustilago avenae on Arrhenatherum elatius

same plant, somewhat less than a year later (the fungus is systemic): earlier stage of the infestation

Ustilago avenae on Arrhenatherum elatium

Arrhenatherum elatius, Niewendam; whether the reduction of the awns is connected with the infection is not clear

Ustilago avenae on Arrhenatherum elatium

all ovaries are black and swollen

Ustilago avenae on Arrhenatherum elatium

the fungus erupts through the glumes

Ustilago avenae on Arrhenatherum elatium

seen from the side

Ustilago avenae on Arrhenatherum elatius

ten days later; the glumes are intact, within them the destruction is complete

Ustilago avenae: spores

spores

gall

The fungus primarily affects the ovaries, to a lesser degrees also the other parts of the spikelet. Spores c. 6 µm, olive brown when ripe; then also one can see that the spores are lighter at one side; wall spinulose. The infection begins at the seedlings.

hostplants

Poaceae, oligophagous

Aegilops cylindrica, triuncialis; Arrhenatherum elatius; Avena barbata, fatua, nuda, sativa, sterilis & subsp. ludoviciana, strigosa; Dasypyrum villosum; Hordeum, murinum, vulgare & ? subsp. distichon.

synonyms

Ustilago arrhenatheri Schellenberg, 1915; U. decipiens (Wallroth) Liro, 1924; U. levis (Kellerman & Swingle) Magnus; U. nigra Tapke, 1932; U. rostrupii Kutinen, 1922; U. segetum var. avenae (Persoon) Brunaud, 1878; U. aegiliopsidis Picbauer, 1932.

references

Ainsworth & Sampson (1950a), Almaraz (1998a), Buhr (1964b), Doppelbauer (1973a), Ellis & Ellis (1997a), Ivić, Sever, Scheuer & Lutz (2013a), Jage, Klenke, Kruse ao (2016a), Jage, Kruse, Kummer ao (2013a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Llorens i Villagrasa (1984a), Losa España (1944a), Lutz & Vánky (2009a), Melgarejo Nárdiz, García-Jiménez, Jordá Gutiérrez ao (2010a), Navarro, Honrubia & Torres (1986a), Nielsen & Huang (1984a), Prillinger, Wuczkowski, Lopandic ao (2009a), Savchenko & Heluta (2012a), Scheuer & Bechter (2012a), Scholz & Scholz (2013a), Tomasi (2014a), Unamuno (1941b, 1942a), Vanderweyen & Fraiture (2014a), Vánky (1994a), Vánky & Abbasi (2013a), Zwetko (1993a).

28/05/2017

pub 28.v.2017 · mod 12.viii.2017