Biology Reference
In-Depth Information
603
604
603 Juniper webber moth ( Dichomeris marginella ).
604 Juniper webworms ( Dichomeris marginella ).
Dichomeris marginella (Fabricius) ( 603-604 )
Juniper webber moth
larva
Hypatima rhomboidella (Linnaeus) ( 605-606 )
syn. H. conscriptella (Hübner)
A minor pest of birch ( Betula ) and hazel ( Corylus );
occasionally found on nursery trees. Widely distributed
in central Europe; also found in the more southerly parts
of northern Europe.
juniper webworm
A locally common pest of juniper ( Juniperus ), often
causing damage to ornamental plants in gardens and
nurseries. Widespread in Europe; also present in parts of
North America.
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DESCRIPTION
Adult: 13-16 mm wingspan; fore wings elongate, light
grey, each with a conspicuous blackish, triangular
blotch and a terminal streak; hind wings light grey.
Larva: up to 12 mm long; green or pinkish brown, with
small, black pinacula; head and prothoracic plate shiny
black.
DESCRIPTION
Adult: 15-16 mm wingspan; fore wings dark brown,
with a white stripe along the anterior and hind margins;
head and thorax white. Larva: up to 10 mm long; light
brown, with darker dorsal and subdorsal stripes, the area
between often slightly whitish; head and prothoracic
plate brown to brownish black.
LIFE HISTORY
Adults occur in July, August and September. They often
hide amongst dead leaves during the day, scurrying
away if disturbed. The larvae feed on the leaves if birch
and hazel in the following May and June, each
sheltering within a rolled leaf or folded leaf edge. Fully
grown individuals usually pupate amongst debris on the
ground, and the adults emerge shortly afterwards. There
is one generation annually.
LIFE HISTORY
Adults occur in July and August, depositing eggs in
groups on host plants. The larvae feed gregariously in
May and June, webbing the shoots together with silken
threads. Fully grown larvae pupate in cocoons spun
amongst the webbing, and moths appear a few weeks
later.
DAMAGE
Infested shoots are disfigured by webbing, much of the
foliage dying and turning brown.
DAMAGE
Infested leaves attract attention but damage caused is of
no importance.
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