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Identifying
Mines:
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
frass,
whereas
Diptera larvae are maggots and the mines are either lower or upper-surface (or
a mixture of both). They characteristically
make
twin
trails
of
frass.
Hymenoptera mines are blotches and have characteristically more copious and darker
frass, when compared to dipterous mines. Hymenoptera larvae have visible legs.
Several
species,
including
Coleoptera,
make
cut-outs
in the leaf and the form of these can aid identification. |