Dichotomous table for gallers on Lycopsis arvensis
by Hans Roskam
1a Galls on parts above ground => 2
1b Side roots often with many nodular to spindle-shaped swellings, which bear some lateral roots. Meloidogyne hapla
2a On flowers or inflorescences => 5
2b On vegetative organs => 3
3a Large parts of plant disfigured => 4
3b Leaf blade, especially in venation, with rotund to ± acuminated, oval, often conspicuous yellow to yellow-brown swellings, occurring especially on underside, which are marbled, sieve-like. Occasionally on stems. Puccinia recondita
4a Growth stunted, leaves rolled downwards, curled. Also on disfigured, ± etiolated flowers. Dictyla echii
4b Basal stem parts variously swollen, spongy ± pale green. Ditylenchus dipsaci
5a Inflorescence clustered, ball-like. Brachycaudus helichrysi
5b lowers greened, densely white pubescent, clustered, ball-like. Aceria eutricha