Pisum garden pea
Dichotomous table for leafminers
Mines can occur also in the petioles and even in the tendrils. These can be indentified only by a study of the larvae or by breeding.
1a corridor, widening into a large blotch => 2
1b a corridor from begin to end => 3
1c galls, etc => Tables for all parasites per species
2a frass powdery, in black-green clouds along the margins of the blotch or in the end of short side branches: Scaptomyza flava
2b frass in large, widely separated black lumps: Agromyza lathyri
3a puparium in the mine, in a, usually under-surface, pupal chamber: Chromatomyia horticola
3b before pupation the mine is left through a semicircular exit slit => 4
4a frass in a broad, central green band; larva: rear spiraculum with 3 papillae: Liriomyza congesta
4b frass in black thread fragments, never in a green band; rear spiraculum with > 3 papillae => 5
5a corridor pinnately branched, main branch overlying the midrib: Liriomyza strigata
5b corridor not pinnate => 6
6a corridor usually beginning upper-surface, but further on turning lower-surface; most mines in the basal half of the leaf; corridor often follows the midrib for some stretch: Liriomyza huidobrensis
6b corridor beginning lower-surface, often remaining so till the end; mines in the entire leaf, without a tendency to follow the midrib: Liriomyza pisivora
Not included in the key: Amauromyza chamaebalani; Liriomyza bryoniae, trifolii.