Plant Parasites of Europe

leafminers, galls and fungi

gallers on Microrrhinum

Dichotomous table for gallers on Microrrhinum

(ex Chaenorhinum p.p.)

by Hans Roskam

1a On stems or leaves => 2

1b Fruit swollen, ± disfigured. M. litorale, minus: Rhinusa antirrhini

2a Galls on stems => 3

2b Shoot tips, if heavily infected, slightly stunted, slightly thickened; the inserted leaves clustered, leaf blades stunted, their margins rolled, ± distorted; bearing down of branched conidiophores. M. minus: Peronospora linariae

2c Complete plant disfigured, additionally branched; leaves curled and twisted; flower primordia, if present, aborted. M. minus: Cause unknown – ? gall mite

3a Shoot axis with conspicuous, one-chambered, rotund or multi-chambered, oblong swellings. Each chamber containing a single larva. M. minus: Rhinusa pilosa

= Inquiline in galls of R. pilosa: Rhinusa eversmanni

3b Stem with weak spindle-shaped swelling. Containing a single larva. M. minus: Mecinus janthinus

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