Plant Parasites of Europe

leafminers, galls and fungi

gallers on Daphne

Dichotomous table for gallers on Daphne

by Hans Roskam

1a Galls on parts above ground => 2

1b Root collar with conspicuous, at first succulent, later on ± woody, cancer-like proliferations. D. mezereum: Agrobacterium tumefaciens

2a On twigs, shoot tips or leaves => 3

2b Perianth at base rounded, swollen, disfigured, up to 3–5 mm long. Containing several, whitish larvae. D. gnidium, laureola, mezereum, striata: Dasineura daphnephila

3a On shoot tips or leaves => 4

3b Swelling of twig, about 50–60 mm long, 5 mm broad, contains long tunnels sometimes with several larvae. D. gnidium, laureola, mezereum: Phyllobrostis eremitella

4a Leaves loosely rolled downwards and curved. D. aureola, mezereum, striata:
Macrosiphum daphnidis

4b More or less distinct malformation on leaves. D. mezereum: Aculus daphnes

4c Leaves on stunted shoot tip clustered, tuft-like, elongated, locally thickened, ± discoloured red, developing into an oblong-oval or spindle-shaped gall, up to 30 mm long and 5–10 mm thick, sometimes sickle-shaped. Contains several white larvae. D. cneorum, laureola, mezereum, striata: Dasineura daphnes

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