Gnaphalium, cudweed

Incl. Filaginella, Laphangium, Omalotheca.

1a fleck mine; larva mines from a case => 2

1b mine upper- or lower-surface; larva a maggot => 3

1c mine full depth; larva with chitinised head => 6

1d galls, etc => 100

2a brownish black sheath case: Coleophora caelebipennella

2b light coloured tubular silken case: Coleophora gnaphalii

3a pinnately branched corridor, main branch positioned over the midrib: Liriomyza strigata

3b mine consists of several corridors that radiate from the base into the leaf: Ophiomyia gnaphalii

3c mine not associated with leaf base or midrib => 4

4a mine a corridor untill the end; pupation in the leaf in a, usually lower-surface, pupal chamber: Chromatomyia cf. syngenesiae

4b mine strongly widened towards the end; larva leaves the mine prior to pupation through a semicircular exit slit => 5

5a blotch, prededed by a lower-surface gallery: Phytomyza kyffhusana

5b gallery throughout (subtropical exotic species): Liriomyza trifolii

6a larva without feet: Orthochaetes insignis

6b larva with thoracic feet => 7

7a mine small, larva grey: Cnephasia incertana

7b mine not unusually small; larva not grey => 8

8a mine (partly) a gallery => 9

8b blotch => 10

9a a gallery, initially very fine, untill the end: Bucculatrix gnaphaliella

9b gallery locally and terminally strongly widened: Digitivalva reticulella

10a mine with copious amounts of frass: Tebenna micalis

10b mine almost without frass => 11

11a the larve mines from a silken tube on the ground: Scrobipalpula psilella

11b no silken tube => 12

12a larva bluish white, with three yellow, later red length line: Scrobipalpa murinella

12b larva yellow with five red length lines [teste Hering, 1957a]; high alpine species: Scrobipalpula diffluella

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

101b Meloidogynidae: Meloidogyne hapla

103 – Coleoptera

103a Apionidae: Acentrotypus brunnipes

104 – Diptera

104a Tephritidae: Actinoptera discoidea

105 – Hemiptera

105a Aphididae: Pemphigus populinigrae

108 – smut fungi

108a Entylomataceae: Entyloma magnusii

109 – powdery and downy mildews

109a Erysiphaceae: Neoërysiphe gnaphalii

110 – other causers

110a Fungi, Albuginaceae: Pustula obtusata

110b Lepidoptera, Tortricidae: Eucosma albidulana

Not includeded in the key: Digitivalva reticulella; Phytomyza hedingi (mine not known), 20/11/2015