Biology Reference
In-Depth Information
Phyllonorycter quercifoliella
(Zeller)
(537)
Generally common on oak (
Quercus
), including young
trees, the larvae forming mainly oval mines on the
underside of the leaves. The mines usually occur
between the major veins, their upper surface being
characterized by a central patch of unconsumed tissue.
The larvae feed in July and from September to
November. The golden-brown, white-marked adults
(7-9 mm wingspan) emerge in late April or May and in
August.
underside of the leaves during the summer and again in
the autumn. There are often several mines in each
infested leaf but they cause only slight distortion.
Adults (7-9 mm wingspan) are brown, marked with
white; they occur in May and again in August.
Phyllonorycter robiniella
(Clemens)
(539-540)
Following its accidental introduction to Switzerland in
1983, this North American species has become widely
distributed in mainland Europe on false acacia (
Robinia
pseudoacacia
). The larvae mine within large blotch
mines, formed on the underside of the leaves
(cf.
Parectopa robiniella
, p. 228). Trees are often
heavily infested, and the mines frequently coalesce; the
larvae then feed gregariously. The pest completes two or
three generations annually.
Phyllonorycter rajella
(Linnaeus) (
538
)
syn.
Phyllonorycter alnifoliella
(Hübner)
A widespread and often abundant leaf miner on alder
(
Alnus
), including amenity and nursery trees. There
are
two generations annually, larvae mining the
537
538
537
Mines of
Phyllonorycter quercifoliella
in leaf of
Quercus
.
538
Adult of
Phyllonorycter rajella
.
540
539
539
Leaf mines of
Phyllonorycter robiniella
on
Robinia
,
viewed from above.
540
Leaf mines of
Phyllonorycter robiniella
on
Robinia
,
viewed from below.
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