Plant Parasites of Europe

leafminers, galls and fungi

gallers on Robinia

Dichotomous table for gallers on Robinia pseudoacacia

by Hans Roskam

1a On parts above ground => 2

1b Roots with laterally inserted nodules, rotund to oblong-oval or terminally broadened and hand-shaped to coralloid forked, up to 10 or more mm long, occasionally clustered. Rhizobium leguminosarum

2a On leaves => 3

2b Branches with ± distinct spindle- or club-shaped swellings, bearing. Viscum album

3a Malformations of leaflet caused by aphids => 5

3b Malformations of leaf caused by other animal inducers => 4

4a Cartilaginous, yellowing downward rolls of leaflet margins. Containing several whitish midge larvae, often together with orange-yellow pupae. Obolodiplosis robiniae

4b Leaflets curled, ± bluish discoloured, ± rolled at margin. Aculops allotrichus

5a Leaflet rolled downwards, curled. Aphis craccivora

5b Similar malformations. Aphis fabae

Last modified 16.vi.2020