Potentilla, cinquefoil

Incl. Argentina anserina. Also Duchesnea indica, the mock strawberry, is currently included in Potentilla. See also Comarum and Drymocallis. For Potentilla fruticosa see Dasiphora.

1a blotch, no trace of a preceding corridor => 2

1b corridor, may widen into a blotch => 6

1c fleck mine; larva in a lobe case => 15

1d galls, etc. => 100

2a the blotch soons turns into an elliptic excision: Incurvaria praelatella

2b no excision is made => 3

3a mine tiny; larva yolk-yellow: Spialia sertorius

3b mine larger; larva not yellow => 4

4a on the oviposition spot, usually near the leaf margin, a shining black drop of dried secretion: Trachys fragariae

4b no such drop => 5

5a larva: no claw at the end of the feet; common species: Fenella nigrita

5b the feet end in a distinct claw; only known from Hungary on P. cinerea: Fenella arenariae

6a mine begins at a globular, shining egg shell => 7

6b no egg shell visible => 13

7a mine begins with a strongly contorted corridor: Ectoedemia arcuatella

7b initial corridor not contorted => 8

8a mine remains a gallery till the end => 9

8b gallery widens into an irregular, often large, blotch => 11

9a egg at the underside of the leaf: Stigmella thuringiaca

9b egg at the upperside (rarely underside, but the gallery then very slender) => 10

10a frass in the first section of the gallery diffuse, greyish green: Stigmella anomalella

10b frass black and granular, also in the first section: Stigmella splendidissimella

11a egg at the upperside: Stigmella poterii

11b egg at the underside => 12

12a lowland species: Stigmella aeneofasciella

12b always, or almost always, high in the mountains: Stigmella stelviana (always) & Stigmella tormentillella (almost always)

13a initial corridor short, quickly widening; mine full depth; larva with chitinised head => 5

13b initial corridor longer and/or widening more slowly; mine upper- or lower-surface; larva a maggot => 14

14a frass in the corridor part in two rows of grains; larva: rear spiraculum with 3 papillae: Agromyza idaeiana

14b initial corridor almost full of frass; rear spiraculum with 6 papillae: Agromyza sulfuriceps

15a case helicoidal; opening of the mine not neatly circular: Apterona helicoidella

15b case more or less straight; opening a perfect circle => 16

16a spatulate leaf case: Coleophora albicostella

16b lobe case => 17

17a case brown; lobes of the case cut out of the upper epidermis; mouth angle 0°-10°: Coleophora violacea

17b case whitish; lobes cut out of the lower epidermis; mouth angle 20°-30°: Coleophora potentillae

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

103 – Coleoptera

103a Curculionidae: Anthonomus rubi

105 – Hemiptera

105a Aphididae: Aphis tormentillae

105b Asterolecaniidae: Planchonia arabidis

105c Triozidae: Bactericera lyrata, , reuteri

106 – Hymenoptera

106a Cynipidae: Diastrophus mayri; Xestophanes brevitarsis, potentillae, szepligetii

107 – rust fungi

107a Phragmidiaceae: Phragmidium fragariae, potentillae

107b Pucciniaceae: Frommeella mexicana, tormentillae

109 – powdery and downy mildews

109a Erysiphaceae: Podosphaera aphanis

109b Peronosporaceae: Peronospora oblatispora, potentillae, potentillae-anserinae, potentillae-reptantis, potentillae-sterilis

110 – other causers

110a Fungi, Capnodiales: Ramularia grevilleana

110b Fungi, Synchytriaceae: Synchytrium aureum, cupulatum, globosum, pilificum, potentillae

110c Fungi, Taphrinaceae: Taphrina potentillae

110d Fungi, Venturiaceae: Venturia potentillae

Not included in the key: Coleophora ahenella, sergiella, vitisella; Sophronia humerella; Tinagma perdicella.

pub 28.vi.2016 · mod 4.ix.2017