Plant Parasites of Europe

leafminers, galls and fungi

Saxifraga

Saxifraga saxifrage

(For a dichotomous table for galls on Saxifraga by Hans Roskam click here)

Dichotomous table for leafminers

1a large blotch in one of the lower leaves, continuing through the petiole and root collar down to the roots: Otiorhynchus rugifrons

1b if the mine at all includes the petiole, it is not in the lower leaves and does not extend to below ground => 2

1c galls, etc => Tables for all parasites per species

2a corridor, later a blotch in which a circular excision is made: Alloclemensia mesospilella

2b no excision => 3

3a irregular, small, blotch or corridor in early spring; older larvae live free among spun young leaves => 4

3b not this combination of characters => 6

4a larva: pinacula colourless (but the base of the setae black): Cnephasia incertana

4b pinacula black => 5

5a larva has a chitinous comb below the anus: Cnephasia asseclana

5b larva without such a comb: Cnephasia stephensiana

6a larva a maggot=> 7

6b larva with thoracic feet and a chitinised head => 8

7a larva: rear spiracula fused into a reddish brown tube that extends behind the : Cheilosia semifasciata

7b rear spiracula not fused, colourless (rarely black) => 8

8a on rosette-forming Saxifraga species: Chromatomyia aizoon

8b on Saxifraga’s that do not form rosettes => 9

9a on Saxifraga rotundifolia: Chromatomyia saxifragae

9b on Saxifraga carpatica: Liriomyza clarae

10a mined rosette covered in spinning: Kessleria saxifragae

10b larva does produce (almost) no silk => 11

11a the larva begins its life by making a corridor: Kessleria alpicella

11b the mine starts as a blotch: Stenoptilia millieridactylus

Not included in the key: Cnephasia ecullyana; Kessleria albescens, alternans, inexpectata, insubrica, klimeschi, orobiae, wehrlii, zimmermanni..

Tables for all parasites per species

Last modified 12.iv.2020