gallers on Calepina

1a On parts above ground => 3

1b On root collar or on roots => 2

2a Root collar with rotund galls, up to about 8 mm long, succulent, one-sided, one-chambered. Containing a single larva. Ceutorhynchus assimilis

2b Roots with conspicuous, spindle-shaped to cylindrical swellings, 3–12 mm long succulent, compact. Plasmodiophora brassicae

3a Midrib of leaves or young stems with 12–20 mm long spindle-shaped swellings. Containing a single larva. Ceutorhynchus chalybaeus

3b According to literature on this host also Brevicoryne brassicae as well as Albugo candida