Plant Parasites of Europe

leafminers, galls and fungi

gallers on genus Agrostemma

Dichotomous table for gallers on Agrostemma githago

by Hans Roskam

1a On vegetative organs => 2

1b Anthers in rarely disfigured flowers temporarily swollen; later filled with black-violet spores. Microbotryum violaceum

2a Malformations with surface fruiting fungi, at least temporarily => 5

2b Malformations caused by animals => 3

3a Malformations on stems or leaves of ± developed plants => 4

3b Young plants severely stunted; especially the basal parts swollen, spongy. Swellings pale green, undulate at surface. Ditylenchus dipsaci

4a Stem with localised swellings. Unidentified lepidopteran

4b Tuft-like accumulation of basally strongly pubescent leaves. Inducer unknown

4c Stem stunted locally, one or two neighbouring leaves strongly rolled over their tips; close to the froth-covered nymph undulate, deep-green. Philaenus spumarius

5a Leaves on underside with rotund, ring-shaped or sometimes oblong compact crusts of coalescing sori on slightly swollen bulges; at first bearing pale, later on with black-brown telia. Bulges also developing on calyx teeth and stems. Puccinia arenariae

5b Leaves and stems with yellowish, ± swollen spots; diseased leaf blades, and even the corolla, often characteristically curled; sori ± grey frosted when asci are mature. Taphrina githaginis

Last modified 18.xi.2023