Plant Parasites of Europe

leafminers, galls and fungi

Gymnosporangium sabinae

Gymnosporangium sabinae (Dickson) Winter, 1884

on Pyrus

Gymnosporangium sabinae: spermogonia on Pyrus pyraster

Pyrus pyraster, Belgium, prov. Namur, Couvin (Frasnes), Carrière des Grosses Haies: spermogonia © Stéphane Claerebout

Gymnosporangium sabinae: spermogonia on Pyrus pyraster

detail

Gymnosporangium sabinae: spermogonia on Pyrus pyraster

the underside of the leaf is clearly galled here

Gymnosporangium fuscum

Pyrus communis, Elburg © Arnold Grosscurt

Gymnosporangium fuscum

underside of leaf with aecia

Gymnosporangium sabinae on Pyrus calleryana

Pyrus calleryana, Hongarije, Budapest © László Érsek

Gymnosporangium sabinae on Pyrus calleryana: young galling

fresh galling

Gymnosporangium sabinae on Pyrus calleryana: section

horizontal section, with initials of aecia

Gymnosporangium sabinae on Pyrus calleryana: section

vertical section

Gymnosporangium sabinae on Pyrus calleryana: aecium initial

aecium initial

Gymnosporangium sabinae on Pyrus calleryana: fresh  aecia

fresh aecia

gall

in spring epiphyllous pustular spermogonia. Later large orange coloured hypophyllous gallings develop, with up to 2 cm high aecia, opening by a number of lateral slits.

spermogonia, aecia

Rosaceae, monophagous

Pyrus betulifolia, calleryana, communis & subsp. pyraster, elaeagrifolia, nivalis, orientalis, pashia, pyrifolia, regelii, salicifolia, spinosa, syriaca.


on Juniperus

gall

only telia, on swellings of the branches, ± conical, up to 2 mm high, yellowish brown when moist. Teliospores in two forms: hyaline, thin-walled, stout, and brown, thick-walled, slender; spores apically conical. They measure 20-30 x 38-40 µm; each of the two cells with 2 germination pores close to the separation wall.

telia

Cupressaceae, narrowly monophagous

Juniperus chinensis, excelsa, oxycedrus, phoenicea, sabina, thurifera, virginiana.

synonyms

Gymnosporangium fuscum de Candolle, 1905; Roestelia cancellata Rebentisch, 1804.

parasite

Tuberculina persicina.

notes

On pear very common, striking, and damaging.

Closely related with G. sabinae is Gymnosporangium atlanticum, described from Morocco, and possibly occurring also in Spain. The teliospores of G. sabinae are only slightly constricted at the septum and have only two germ pores per cell near the septum, while the teliospores of G. atlanticum are clearly constricted at septum and have up to 6 germ pores per cell with different arrangement (Fernández, Llorens & Alvarado).

references

Bahcecioglu & Kabaktepe (2012a), Bahçecioğlu, Kabaktepe & Yildiz (2006a), Bellmann (2012a), Blumer (1946a), Brandenburger (1985a: 29), Buhr (1964b), Chinery (2011a), Dauphin & Aniotsbehere (1997a), Deckert & Deckert (2016a), Dervis, Dixon, Doğanlar & Rossman (2010a), Fernández, Llorens & Alvarado (2016a), Gäumann (1959a), Gjærum, Gauslaa & Talgø (2008a), González-Fragoso (1925a), Groom (2011a), Helfer (2005a), Henderson (2000a, 2004a), Jage, Klenke, Kruse oo (2016a), Jage, Kruse, Kummer ao (2013a), Jage, Scholler & Klenke (2010a), Karlsson (2008a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a, 2019a), Llorens i Villagrasa (1984a), Maier, Begerow, Weiß & Oberwinkler (2003a), Maier, Wingfield, Mennicken & Wingfield (2007a), Negrean (1996b, 1997a), Poelt & Zwetko (1997a), Preece & Hick (1994a), Redfern & Shirley (2011a), Riegler-Hager (2000a), Roskam (2009a), Scheuer & Bechter (2012a), Termorshuizen & Swertz (2012a), Unamuno (1941b), Vanderweyen & Fraiture (2008a), Wilson & Henderson (1966a), Woods, Stringer, Evans & Chater (2015a), Zhao, Liu, Li & Cai (2016a).

Last modified 6.x.2022