Plant Parasites of Europe

leafminers, galls and fungi

gallers on Berteroa

Dichotomous table for gallers on Berteroa

by Hans Roskam

1a On parts above ground => 3

1b On root collar or on roots => 2

2a Rotund succulent, one-chambered swellings, up to 10 mm long, single or with several on root collar or on neighbouring root- or stem parts. Containing a single larva: Ceutorhynchus assimilis

2b Roots with compact swellings, about 5–10 mm long, ± spindle- or acuminated, cylindrical, succulent: Plasmodiophora brassicae

3a Malformations covered with white fungal sori => 8

3b Malformations caused by animals => 4

4a On inflorescences, flowers or fruits => 7

4b On stems or leaves => 5

5a On leaves => 6

5b Stem swollen in inflorescence area. ? beetle

6a Leaf blades on upper- and underside with felt-like pubescence, half-conical or elongate oval pock-like galls; such pocks sometimes also on calyx or young shoots: Aceria drabae

6b Leaves clustered on terminal shoots, deflected and rolled: Unidentified aphid

7a Flowers clustered in often tight balls; disfigured, ± leafy, corolla partially greened, with abnormal pubescence: Aceria drabae

7b Flowers inflated, disfigured, haired, contain dirty white larvae: Dasineura berteroae

7c Siliques severely disfigured, containing several grey-white larvae: Dasineura napi

8a Sori at first compact, glossy, porcelain-like, with mealy dusting after rupturing; on the leaf underside rotund, on axial parts elongate spindle-shaped; sori sometimes pad- or bulge-like swollen, stem occasionally curved: Albugo candida

8b Sori loose, tuft-like; on ± stunted and thickened, also curved young stem parts or leaf midrib; leaves on completely infected short shoots reduced, pale green, deflected, with white cover on underside: Hyaloperonospora berteroae

Last modified 25.iv.2020