gallers on Neslia

1a On parts above ground => 3

1b On roots or on root collar => 2

2a Long cylindrical- to short barrel-shaped swellings on main- and adventitious roots. Plasmodiophora brassicae

2b Root collar with ± globular swellings; containing a curved beetle larva.
Ceutorhynchus assimilis

3a Malformations caused by fungi => 4

3b talks of flowers or young inflorescences stunted, often ± bent, parts ± disfigured. Brevicoryne brassicae

4a On the leaf blades rotund, on axial parts of leaves, on stems and inflorescences spindle-shaped, at first lacquered glossy, then with white dusting, sometimes curved bulges. Albugo candida

4b Diseased leaves locally swollen or if totally infected ± spoon-like, bent downwards. Stem often infected over large expansion, slightly thickened and variously distorted. On leaf underside and stems expanded white down of branched conidiophores develop. Hyaloperonospora nesliae