Nicotiana, tobacco

1a blotch mine; larva with thoracic feet and chitinised head => 2

1b corridor mine; larva a maggot => 3

1c galls, etc => 100

2a larva: prothoracic unicolorous dark brown: Phthorimaea operculella

2b prothoracic plate pale brown with dark brown rear margin: Tuta absoluta

3a frass in discrete, well-separated grains; puparium in the mine, in a, usually lower-surface, pupal chamber: Chromatomyia horticola

3b frass mostly in strings or pearl chains; pupation outside the mine 4

4a corridor pinnately branched, main branch overlying the midrib; larva: rear spiraculum with 9-13 papillae: Liriomyza strigata

4b corridor not pinnate, freely winding through the blade; rear spiraculum with 7-12 papillae: Liriomyza bryoniae

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 arenaria, incognita, javanica, thamesi

102 – Acari

102a Eriophyidae: Aculops lycopersici

107 – rust fungi

107a Pucciniaceae: Puccinia isiacae

109 – powdery and downy mildews

109a Erysiphaceae: Euoidium longipes; Golovinomyces orontii; Leveillula taurica

109b Peronosporaceae: Peronospora tabacina

110 – other causers

110a Bacteria, Actinomycetales: Rhodococcus fascians