Plant Parasites of Europe

leafminers, galls and fungi

gallers on Andromeda

Dichotomous table for gallers on Andromeda polifolia

by Hans Roskam

1a Malformations on expanded parts of shoot or on leaves => 2

1b Stem with rimmed depressions with causer under a 2.5 (3) mm long scale.
Chionaspis salicis

2a Single or several leaves with localised malformations => 3

2b Complete shoots infected, ± etiolated or ± disfigured witches’ broom-like. Leaves partially larger, partially smaller than healthy ones; hardly thickened; sometimes pale-green, often conspicuously reddened. At maturity of fungus the underside with white down of basidia. Exobasidium myrtilli

3a eaf blade ± keel-shaped curved, hardly thickened. Conspicuously rolled downwards at margin, ± reddish discoloured. Cecidophyopsis ruebsaameni

3b Leaf blades with expanded, strongly swollen, usually conspicuously reddened swellings. Twigs hypertrophied, leaves disfigured and discoloured reddish to violet. Exobasidium karstenii

3c Twigs not thickened, but leaves broadened and thickened, reddish. Exobasidium sundstroemii

Last modified 22.vi.2020