Saxifraga, saxifrage

fam. Saxifragaceae

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 => 100

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 rossette coveres 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

100a Nematoda => 101

100b Acari => 102

100c Coleoptera => 103

100e Diptera => 104

100f Hemiptera => 105

100d Hymenoptera => 106

100g rust fungi => 107

100h smut fungi => 108

100i powdery and downy mildews => 109

100j other causers => 110

101 – Nematoda

101a Anguinidae: Ditylenchus dipsaci

102 – Acari

102a Eriophyidae: Aceria saxifragae; Aculus kochi

104 – Diptera

104a Cecidomyiidae: Dasineura saxifragae

105 – Hemiptera

105a Triozidae: Trioza remaudierei

109 – powdery and downy mildews

109a Erysiphaceae: Podosphaera alpina, macrospora

109b Peronosporaceae: Peronospora minima, saxifragae

110 – other causers

110a Fungi, Exobasidiaceae: Arcticomyces warmingii

110b Fungi, Synchytriaceae: Synchytrium rubrocinctum, saxifragae

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

09/04/2017