Plant Parasites of Europe

leafminers, galls and fungi

gallers on Bidens

Dichotomous table for gallers on Bidens

by Hans Roskam

1a On above-ground parts => 2

1b Roots with slender, spindle-, club- or nodule-shaped swellings. B. tripartita: Meloidogyne hapla

2a On vegetative parts => 3

2b Tephritid larvae in flower heads. B. cernuus, tripartita: Dioxyna bidentis

3a Leaf blades with conspicuous ripples => 4

3b Basal leaves, especially on the underside of the leaf blades, with many golden-yellow translucent warts, less than 1 mm long, ± hemispherical. B. tripartita: Synchytrium aureum

4a Leaf blade areas in different ways ± loose nest-like, curved downwards. Strongly curled and dark green, especially close to the froth-covered nymph. Bidens spp.: Philaenus spumarius

4b Leaf blade partially at the margin loosely curved and curled downwards. B. cernuus, frondosus, pilosus, tripartitus: Brachycaudus helichrysi

Last modified 30.iv.2020