Plantparasieten van Europa

bladmineerders, gallen en schimmels

gallers on Peucedanum

Dichotomous table for gallers on Peucedanum

by Hans Roskam

1a On parts of flowering or fruiting inflorescences => 21

1b On vegetative plant parts => 2

2a Malformations mainly of leaf segments => 13

2b Malformations mainly of stems, petioles and midrib or of venation of leaflets => 3

3a More or less spindle-shaped bulges caused by rust fung => 4

3b Spindle-shaped, vitreous, glabrous, yellowish-green, later brownish bulges on leaf axis and stem. Spores develop inside the galls. P. ostruthium, palustre: Protomyces macrosporus

4a Galls caused by mycelia developing uredinia or telia => 6

4b Galls caused by mycelia developing aeci => 5

5a Distinctly protruding swelling on leaf veins, -midrib or -stalks of P. ostruthium: Puccinia imperatoriae-mamillata

5b Similar malformations on P. rablense: Aecidium peucedani-raiblensis

6a Galls caused by primary mycelium developing uredinia accompanied by spermogonia. Sori with secondary uredinia or telia small, usually non-cecidogenic, often many on leaves, partially also on stems => 7

6b Fungus develops only telia on conspicuous, rather strongly swollen, rotund or elongated bulges on the leaf underside or on leaf axis. P. ostruthium: Micropuccinia imperatoriae

7a Fungi belonging to the Puccinia bullata species complex, distinguished by glabrous teliospores; morphologically partially ± similar but biologically usually distinctly different => 10

7b Teliospores covered with parallel running lines => 8

8a On P. oreoselinum or P. verticillare. Teliospores bearing loosely distributed warts => 9

8b On P. coriaceum, parisiense, ruthenicum, officinale: Puccinia rugulosa

9a On P. oreoselinum. The primary, cinnamon-brown uredinia develop on usually conspicuous, curved bulges on leaf venation, -midrib and -stalks: Puccinia oreoselini

9b On P. verticillare: Puccinia terrieri

10a On P. alsaticum, palustre, venetum => 12

10b On P austriacum, cervaria, rablense => 11

11a On P. austriacum. Malformations minor and rare: Puccinia peucedani-austriaci

11b On P. cervaria. Galls often conspicuous, on petioles and veins, up to 20 mm long, often curved, bearing spermogonia and primary uredinia: Puccinia cervariae

12a On P. alsaticum: Puccinia peucedani-alsatici

12b On P. palustre. Distinct swellings, up to several cm. long, on leaf veins, -midrib and -stalks, sometimes on stems: Puccinia semadenii

13a Leaflet with narrow marginal roll => 20

13b Leaflets with bulging swellings, curls or loose folds, or rolls of their margins => 14

14a Malformations with downwardly bent margins => 15

14b ip of leaflet folded upwards or rolled inwards, partially curled, thickened at base, discoloured ± yellowish to reddish. Containing white larvae. P. cervaria, oreoselinum: Macrolabis incognita and/or: Jaapiella buhri

15a Expanded malformations of leaf blades or conspicuously discoloured marginal roll, or fold => 16

15b Curling of tip leaflet. P. oreoselinum: Trioza sp.

15c On the leaves of P. ostruthium have been recorded the larvae of Trioza apicalis

16a Malformation caused by aphids or by surface fruiting fungi => 17

16b Leaf midrib sometimes stunted over large areas, bearing clustered, sometimes nest-like converging, locally deep green coloured leaves. Peucedanum spp.: Philaenus spumarius

17a Malformations caused by aphids => 18

17b Leaf blade pale green, swollen, bladder-like, mainly on upperside soon covered with loosely arranged fungal fruiting bodies. P. palustre: Taphridium umbelliferarum

18a Malformations on expanded leaf parts => 19

18b Terminal parts of leaflets partially or completely ± mussel-shaped, deflected downwards or loosely rolled, slightly thickened, conspicuously discoloured red and yellow. Aphid yellow to bright greenish-yellow. P. cervaria, oreoselinum: Semiaphis cervariae

19a On P. palustre. Severe stunting of midrib; leaflets, occasionally at terminal leaf part densely clustered, nest-like at tip and margin deflected: Semiaphis anthrisci

19b On P. officinale; colonising shoot tips and deforming leaves: Semiaphis horvathi

19c On P. ostruthium. Leaf blades rolled downwards or arched. Malformations sometimes expanded; leaves converged, nest-like:Semiaphis sphondylii

20a Tips of leaflets stunted, rolled at margin, ± twisted and discoloured. P. arenarium, palustre; Aceria peucedani

20b Similar malformations on P. oreoselinum: Unidentified gall mite

21a Malformations of large parts of inflorescence or galls locally on axial parts => 22

21b Fruit strongly inflated, bladder-like; galls ± reddened, protruding above the umbel; 1 (3) orange-red larvae: Kiefferia pericarpiicola

22a Malformation of expanded parts of inflorescence => 23

22b Centre of umbel or stalk of umbel ± swollen, club-shaped, sometimes also affecting the base of the stalks of umbels. Inner wall covered with mycelium. Containing a red larva: Lasioptera carophila

23a Inflorescences and ± greened flowers variously disfigured by aphids. P. palustre: Semiaphis anthrisci

23b Similar, often compact malformations caused by mites, often associated with severe greening and malformation of flowers. P. carvifolia, cervaria, oreoselinum, palustre, venetum: Aceria peucedani

Laatste bewerking 30.iii.2020