Plant Parasites of Europe

leafminers, galls and fungi

gallers on Fagopyrum

Dichotomous table for gallers on Fagopyrum

by Hans Roskam

1a On parts above ground => 2

1b Nodular swellings on main-roots, occasionally on thicker side roots. F. esculentum, tataricum: Meloidogyne hapla

2a Malformations caused by animals => 3

2b Leaf blades with conspicuously arched, pale spots, covered on underside by a down of branched conidiophores. F. esculentum, tataricum: Peronospora ducometi

3a Malformation usually of several terminal leaves, caused by aphids or spittlebugs => 4

3b Complete plant stunted, often excessively branched. Single shoots shortened at base, thickened, ± curved. Axial parts of leaves swollen. Leaf blades partially variously thickened and disfigured. Galls ± wrinkled, necrotic. Containing many eelworms. F. esculentum, tataricum: Ditylenchus dipsaci

4a Black aphids. Leaves singly or on shoot tip with several bulges, margin ± deflected. F. esculentum: Aphis fabae subsp. solanella

4b Stunting, one-sided distortion and clustering of variously disfigured leaves by infestation of stem. Infected leaf blades deflected, curled and often intense green. F. esculentum, tataricum: Philaenus spumarius

Last modified 9.vii.2020