Biology Reference
In-Depth Information
feed for about two weeks. They then pupate, each in a
rounded cocoon spun within the mine. New adults
emerge in the summer. They feed on the leaves before
eventually overwintering.
DESCRIPTION
Adult:
2.2-2.8 mm long; body black, covered with a
greyish-brown pubescence; antennae brown; elytra
distinctly broader than pronotum; eyes close-set; hind
tibiae robust.
Larva:
up to 5 mm long; head blackish;
body white, shiny and distinctly tapered posteriorly.
DAMAGE
Adult feeding is usually of minor importance; the larval
mines are disfiguring and cause noticeable distortion of
affected leaves.
LIFE HISTORY
Adults overwinter under bark, in the ground and in other
shelter, emerging from hibernation in late April or early
May. They then invade beech trees to feed on the
foliage. Eggs, usually 30-35 per female, are laid singly
on the underside of the midrib of expanded leaves; less
often, they are placed beneath a lateral vein. Larvae
mine within the leaves from May to June, each forming
a brownish-black gallery. This commences as a narrow
Orchestes fagi
(Linnaeus) (
329-332
)
syn.
Rhynchaenus fagi
(Linnaeus)
Beech leaf-mining weevil
larva
beech leaf miner
A common and widely distributed pest of beech (
Fagus
sylvatica
). Present throughout Europe.
=
329
330
329
Beech leaf-mining weevil (
Orchestes fagi
).
330
Beech leaf miner (
Orchestes fagi
).
331
332
331
Mines of beech leaf miner (
Orchestes fagi
) on
Fagus
.
332
Pupal cocoon of beech leaf-mining weevil (
Orchestes
fagi
).
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