Polemonium, jacob’s ladder

fam. Polemoniaceae

1a a corridor, of roughly equal width throughout its length => 2

1b mine (partly) an elongated blotch => 4

1c galls, etc => 100

2a frass in loose, widely dispsersed grains; puparium in the mine, in a, usually lower-surface, pupal chamber: Chromatomya horticola

2b frass in strings or thread fragments; pupation outside the mine => 3

3a corridor unbranched, not associated with the midrib: Liriomyza bryoniae

3b corridor usually with some side branches; main branch overlying the midrib: Liriomyza strigata

4a blotchy part of the mine overlying the midrib: Liriomyza xanthocera

4b blotchy part of the mine not associated with the midrib: Liriomyza aterrima

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

102 – Acari

102a Eriophyidae: Tegonotus septentrionalis

107 – rust fungi

107a Pucciniaceae: Puccinia polemonii

108 – smut fungi

108a Entylomataceae: Entyloma lapponicum

109 – powdery and downy mildews

109a Erysiphaceae: Golovinomyces magnicellulatus; Podosphaera polemonii, xanthii