Dichotomous table for gallers on Adenostyles
(incl. Cacalia)
by Hans Roskam
1a On vegetative parts => 2
1b Capitula greatly enlarged, bell-shaped, up to 10 mm long and 4 mm thick; receptacle spongy, swollen. A. alliariae: Unidentified tephritid fly
2b Leaf blades bent and curled => 3
3a Leaf blades over large areas or completely curled. A. alpina: Unidentified aphid
3b Additionally, the bright yellow to yellow-green facultative gall causer, known from many host species. A. alliariae: Brachycaudus helichrysi
3c Leaf blade strongly recurved, strongly curled and dark green close to the froth covered froth-covered nymph. A. alpina: Philaenus spumarius
4a Leaf blade on underside with small, rotund, compact, brownish swellings, covered with 2-celled telia. A. alliariae, alpina, leucophylla: Puccinia expansa
4b Weak, ± extended, usually yellow-bordered, densely covered with aecia cushions or callus on the leaf undersides of A. alliariae, alpina: Uromyces veratri