Dichotomous table for gallers on Chelidonium majus
by Hans Roskam
1a On parts above ground => 2
1b Roots with spindle-shaped to nodular swellings. Meloidogyne hapla
2a Leaf blades weakly wrinkled, margins slightly bent. Acyrthosiphon chelidonii
2b Weakly wrinkled and ± discoloured leaves caused by aphids. Aphis fabae
2b Wrinkled leaves. Malformations caused by froth-covered nymphs of Philaenus spumarius
2b Flowers distinctly swollen, unopened; many yellow, non-jumping larvae inside. Jaapiella chelidonii
2b Pods irregularly swollen. Containing several yellowish, non-jumping larvae.
Unidentified gall midge