Plant Parasites of Europe

leafminers, galls and fungi

gallers on Onopordum

Dichotomous table for gallers on Onopordum

by Hans Roskam

1a Receptacle thickened and hardened, with several oblong oval chambers vertical to surface, each containing a single maggot. O. acanthium, cynarocephalum: Tephritis postica

1b Similar malformations. O. acanthium: Urophora mauritanica

1c Larger parts of rosette leaves strongly curved downwards and curled; discoloured dark green close to the froth-covered nymph O. acanthium: Philaenus spumarius

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