Plant Parasites of Europe

leafminers, galls and fungi

Synchytrium taraxaci

Synchytrium taraxaci de Bary & Woronin, 1863

on Taraxacum

Synchytrium taraxaci gall

Taraxacum officinale, Amstelveen, Schinkelbos, 6.ix.2007

Synchytrium taraxaci gall

detail; upper side of the leaf

Synchytrium taraxaci on Taraxacum officinale

Taraxacum officinale, Belgium, prov. Flemish Brabant, Drieslinter, 7.v.2021 © Carina Van Steenwinkel

Synchytrium taraxaci on Taraxacum officinale

in some host plant cells orange sporangia sori are formed, in others grey resting spores.

Synchytrium taraxaci on Taraxacum officinale

the sporangia sori disintegrate, the sporangia are extruded. They soon germinate, releasing zoospores that may reinfect a host plant

Synchytrium taraxaci on Taraxacum officinale

extruded sporangia, next to a host cell with two resting spores

Synchytrium taraxaci on Taraxacum officinale

the resting spores germinate only after hibernation and disintegration of the host material. The zoospores that are then released infect a new generation oh host plants.

Synchytrium taraxaci on Taraxacum officinale

Taraxacum officinale, Belgium, prov. Antwerp, Geel, Gemeentelijke visvijver, 15.vi.2018 © Carina Van Steenwinkel

Synchytrium taraxaci: horizontal section

horizontal section through a sorus

Synchytrium taraxaci: horizontal section

stronger magnification

Synchytrium taraxaci: sorus, transversal section

vertical section through a sorus

Synchytrium taraxaci: release of sporangia

release of sporangia

Synchytrium taraxaci: release of sporangia

stronger magnification

Synchytrium taraxaci  sporangia

sporangia

Synchytrium taraxaci on Taraxacum officinale

Taraxacum officinale, Flevoland, Reve-Abbertbos, 23.ix.2016 © Hans Jonkman: upperside of the disfigured tip of the leaf

gall

leaves with tiny warts, less than half a mm, golden yellow orange to blood-red, usually a large number together.

hostplants

Asteraceae, oligophagous

Centaurea jacea; Crepis alpestris, biennis, vesicaria subsp. taraxacifolia; Taraxacum officinale.

references

Buhr (1964b, 1965a), Dauphin & Aniotsbehere (1997a), Jage, Scholler & Klenke (2010a), Karling (1964a), Klenke & Scholler (2015a), Kruse (2014a, 2019a), Negrean (1996b), Redfern & Shirley (2011a), Roskam (2009a).

Last modified 1.vi.2021