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

1b corridor mine; larva a maggot => 3

1c galls, etc => Tables for all parasites per species

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