Biology Reference
In-Depth Information
accumulated in the centre. Adults appear in May and in
August, and occupied mines occur from June to July,
and from September to October. Larvae (up to 5 mm
long) are orange-yellow, with a brown head and, on the
ventral surface, a line of dark pear-shaped spots. When
fully grown, they pupate externally in brownish-orange
cocoons surrounded by strands of silk. Adults (4-5 mm
wingspan) have mainly dark brown fore wings, each
marked by a narrow, yellowish crossband.
purplish-tinged fore wings) are present in May and
June, with a second generation appearing in August and
September; occupied mines occur mainly in late June,
July, September and October.
Stigmella suberivora
(Stainton) (
482
)
This local species is reported in southern England in
association with holm oak (
Quercus ilex
), and is
gradually extending its range; in Mediterranean areas,
including France and Italy, it is found on cork oak
(
Q. suber
). Adults occur in May and in September,
depositing eggs on the upper side of the leaves; the
yellow-bodied larvae feed in July and August, and from
November onwards, those of the second generation
pupating in the late winter or early spring. Although not
affecting plant growth, the elongate, serpentine mines
disfigure the foliage and become very conspicuous as
leaves age and turn brown.
Stigmella roborella
(Haworth) (
481
)
A widely distributed and generally common leaf miner
on oak (
Quercus
) but its true status uncertain owing to
confusion with closely related species, especially
Stigmella atricapitella
and
S. ruficapitella
. The larvae
form long galleries on the leaves, characterized by the
clearly defined central line of black frass. Adults
(5.0-6.5 mm wingspan, with dark bronzy-brown,
479
480
479
Mine of
Stigmella lapponica
in leaf of
Betula
.
480
Mine of
Stigmella obliquella
in leaf of
Salix vitellina
.
482
481
481
Mine of
Stigmella roborella
in leaf of
Quercus
.
482
Mine of
Stigmella suberivora
in leaf of
Quercus ilex
.
Search WWH ::
Custom Search