Miners tend to be restricted to a certain range of host plants and so the identification
of a miner is facilitated by correctly identifying these plants.
The shape of the mines (gallery or blotch) and the patterns of the droppings
(frass), besides characteristics of the larvae and pupae, can be diagnostic.
Lepidoptera tend to make full depth galleries or blotches with single lines of
Diptera larvae are maggots and the mines are either lower or upper-surface (or
a mixture of both). They characteristically
Hymenoptera mines are blotches and have characteristically more copious and darker
frass, when compared to dipterous mines. Hymenoptera larvae have visible legs.
in the leaf and the form of these can aid identification.