Plant Parasites of Europe

leafminers, galls and fungi

gallers on Selinum

Dichotomous table for gallers on Selinum

(incl. Cnidium)

by Hans Roskam

1a On vegetative parts, on flowers or inflorescences => 2

1b Fruit strongly swollen, bladder-like. Containing a deep orange-red larva. S. carvifolia: Kiefferia pericarpiicola

2a Expanded or locally narrowly confined malformations caused by animal inducers => 5

2b Bulge-like swellings on leaf venation, -stalk or young stem parts, caused by fungi => 3

3a Conspicuous, often ± curved swellings, bearing uredinia or telia => 4

3b Bulges of various size on ± curved leaf blades and axis, bearing yellowish spermogonia and aecia. S. carvifolia: Puccinia bistortae

3c Vitreous bulges. S. carvifolia: Protomyces macrosporus

3d Leaves on the underside a white fungal down of erect conidiophores that apically bear a few short branches, each one ending in an ovoid conidium. S. carvifolia: Plasmopara selini

4a Fungus develops only 3-celled teliospores bearing distal spines. S. carvifolia: Nyssopsora echinata

4b Sometimes up to 30 mm long sori coalescing into ± protruding bulges on stems are induced by a mycelium developing primary uredinia and spermogonia. Teliospores 2-celled. S. carvifolia: Puccinia selini-carvifoliae

5a Malformations caused by aphids, spittlebugs or mites => 6

5b Centre of umbel or stalk of umbel ± swollen, club-shaped. Inner wall covered with mycelium. Containing a red larva. S. carvifolia: Lasioptera carophila

6a Malformations caused by aphids or spittlebugs => 7

6b Complete plant variously stunted. Young stems ± distorted. Umbels stunted; flowers ± greened or leafy. S. carvifolia, dubium, silaifolium: Aceria peucedani

7a Leaflets converging, axis ± deflected, leaf blades curled, wrinkled and deep green at site of infestation. S. carvifolia: Philaenus spumarius

7b Stalks of umbel, sometimes in the same umbel, variously shortened. Flowers clustered; the severely stunted organs sometimes variously greened or also leafy. S. carvifolia: Unidentified aphid

Last modified 18.v.2020