Plant Parasites of Europe

leafminers, galls and fungi

gallers on Jasione

Dichotomous table for gallers on Jasione montana

by Hans Roskam

1a Malformations of shoot tips, stems or capitula => 2

1b Complete plant ± disfigured and sometimes measuring only several cm. Axial parts of non-flowering shoots stunted, causing leaves rosette- or tuft-like clustered, broadened and abnormally pubescent. Leaves of flowering shoots, as well as bracts of capitula ± broadened and strongly abnormally pubescent. Flowers aborted, sterile, ± greened or leafy, pubescent, sometimes excessively branching. Aceria enantha

2a Spindle-shaped swelling of stem or malformation of flower head => 3

2b Shoot tip stunted, leaves accumulated, clustered at tip, rosette-like. In pith an about 8 mm long cavity containing a single larva. Napomyza lateralis

3a Stalk below flower head irregularly thickened, spongy, with wrinkled surface, ± bent. Unidentified eelworm

3b Flower head distorted and etiolated. Thrips major

Last modified 10.viii.2020