Plant Parasites of Europe

leafminers, galls and fungi

gallers on Lilium

Dichotomous table for gallers on Lilium

by Hans Roskam

1a On above-ground parts => 2

1b Nodular swellings on roots. Lilium spp.: Meloidogyne hapla

1c Conspicuous galls on subterranean buds. Lilium spp.: Rhodococcus fascians

2a On severely etiolated flower buds which are occasionally galled => 3

2b Pale, sometimes brownish margined, occasionally inconspicuously swollen spots on leaves and stems, occupied by hardly protruding cups, up to 1 cm long. L. bulbiferum, canadense, candidum, carniolocum, martagon: Uromyces aecidiiformis

2c Underside of the leaves with a whitish fungal down consisting of vertical conidiophores that apically are dichotomously branching several times, each branch ending in an elliptic conidium. L. candidum: Peronospora lilii

3a Malformations lacking additional pubescence => 4

3b The ± disfigured flower buds or also the slightly spreading perianth leaves are covered with long white hairs. Containing many pale yellow larvae. L. martagon: Contarinia martagonis

4a Malformations caused by larvae with inconspicuous head => 5

4b Malformations caused by larvae with distinct head. Flower buds usually not opening, partially swollen, ± crippled, sometimes bent on one side, containing several yellowish-white, elongate oval larvae, which feed on variously disfigured stamens and ovaries or mine into the perianth leaves or also extend into the flower peduncles. L. martagon, rarely candidum: Liriomyza urophorina

5a The compact, mostly stunted buds contain several yellowish, jumping larvae. L. martagon: Contarinia lilii

5b lower buds severely stunted and etiolated. Larvae red. L. candidum: Contarinia liliacea

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