Iris iris

Dichotomous table for leafminers

1a small cavity in the leaf (no corridor, too small to be called a blotch); larva slender, yellow, without feet: Dicerura iridis

1b mine m ore extensive => 2

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

2a larva a maggot; frass in black lumps => 3

2b larva with feet and chitinised head => 4

3a mine uniform in depth, greenish in transparancy; larva solitary; puparium in the mine, positioned parallel to the leaf: Cerodontha iraeos

3b mine strongly variable in depth, in transparancy varying from greenish to glassy; larvae often communal; puparium positioned at right angle to the leaf: Cerodontha iridis

4a larva remains in the mine till close to pupation; mine large: Monochroa divisella

4b only the young larva mines (lives as a borer in the rootstock later); mine small => 5

5a larva: anal shield with tickened rim, ending in two divergent teeth: Orthotelia sparganella

5b anal shield without thickened rim, toothless => 6

6a larva greyish-brown with scattered black dots: Helotropha leucostigma

6b larva pale green; head and pronotum light-brown => 7

6c larva almost black: Oxytripia orbiculosa

7a uniformly light greyish green, with a narrow bright green dorsal length line: Globia algae

7b larva pale greenish with four darker length lines: Globia sparganii

mod 4.ii.2018