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Leaf miner: An
irregularly linear mine which can be both on the upper and lower
leaf surface. Pupation takes place either at the end of the mine
in an exit slit cut in the leaf or on the ground (Spencer, 1972b: 70 (fig. 226), 73; Spencer,
1976: 407 (fig. 712), 408).
Upper
surface corridor, often following the midrib for some distance.
Frequently the very first part of the mine is lower-surface, and
sometimes the entire mine remains at the lower surface. The corridor
is wide from the start, with irregular sides. Frass initially in
two rows of fine grains; further on the grains become larger and
more irregular, sometimes forming pearl chains, and are dispersed
less regularly. Pupation takes place either outside or within the
mine. When the larva has left the mine a semicircular exit slit
is made. When the puparium is formed within the mine the spiracles
do not penetrate the epidermis, and an irregular semicircular opening
is made in the epidermis in front of the puparium.
Mines down the leaf from the tip, then doubles back and then mines towards the apex, often doubling back a second time, towards the leaf base. |