Plant Parasites of Europe

leafminers, galls and fungi

gallers on Laburnum

Dichotomous table for gallers on Laburnum

(incl. Laburnocytisus, Lembotropis)

by Hans Roskam

1a On parts above ground => 2

1b Oval to cylindrical, also hand-shaped to coralloid branched nodules, laterally attached to the roots; occasionally coalesced into larger clusters. Laburnum spp.: Rhizobium leguminosarum

2a On inflorescences or pods => 5

2b On vegetative organs => 3

3a On axial parts => 4

3b Buds swollen, walls of cavity inside lined with black mycelium. L. anagyroides: Asphondylia sp.

3c Leaves stunted, sometimes deflected over their top, margin ± curved downwards, leaf blade folded or curled. Laburnum alpinum, anagyroides, watereri; Lembotropis nigricans: Aphis cytisorum

4a Thicker branches with spindle- to club-shaped swellings bearing mistletoe. Laburnum spp.: Viscum album

4b Bark of young shoots with rimmed depressions, each containing a flat froth-covered nymph. Laburnum spp.: Chionaspis salicis

5a nflorescence variously disfigured. Laburnum anagyroides; Lembotropis nigricans: Aculops cytisicolus

5b Fruit with conspicuous swelling. Laburnum spp.: Inducer unknown

Last modified 27.v.2020