Biology Reference
In-Depth Information
Hedya dimidioalba
(Retzius) (
678-679
)
syn.
H. nubiferana
(Haworth);
Argyroploce
variegana
(Hübner)
An often common pest of trees and shrubs, including
alder (
Alnus
), ash (
Fraxinus excelsior
), flowering cherry
(
Prunus
), rose (
Rosa
) and
Sorbus
; particularly common
on hawthorn (
Crataegus
) and often abundant on garden
hedges. Eurasiatic; also occurs in North America.
weeks before hibernating, each in a dense cocoon spun
within a bark crevice or beneath old bud scales. Activity
is resumed early in the following spring. The larvae then
attack the opening buds, blossom trusses, foliage and
young shoots. During their development, they often
shelter between two leaves webbed together with silk.
Fully grown individuals pupate in spun leaves in late
May or June, and adults emerge 3-4 weeks later.
DESCRIPTION
Adult:
15-21 mm wingspan; fore wings ochreous white
apically, suffused with silver and ochreous grey, the
remainder marbled with dark brown, bluish grey and
black; hind wings brownish grey.
Egg:
0.85
DAMAGE
Larvae contribute to damage done to leaves and
blossoms by other species; they also tunnel into the
young shoots and cause wilting or death of the tips.
0.65 mm;
oval, flat and iridescent.
Larva:
up to 20 mm long;
olive-green to dark green, with black pinacula; head,
prothoracic plate, anal pate and anal comb dark brown
to black; thoracic legs black.
Pupa:
8-10 mm long; dull
black; cremaster tapered, with an apical tuft of eight
hooked bristles.
×
Hedya ochroleucana
(Frölich) (
680-681
)
Locally common on wild rose (
Rosa
) but also
associated with cultivated bushes; adults commonly rest
exposed on the foliage. The larvae feed mainly in the
spring, from April to June, each inhabiting a bunch of
spun leaves. Fully fed specimens (16-18 mm long) are
dull greyish green to olive-green, with inconspicuous
pinacula and a brownish-black to black head and
prothoracic plate. They pupate within the larval
habitation in May or June. Adults (16-23 mm
wingspan) are mainly blackish to bluish grey and
brownish grey, with the fore wings partly creamy white
and often tinged with pink. They occur in June and July.
LIFE HISTORY
Adults occur in June and July, and when at rest (in
common with other species of
Hedya
) they closely
resemble bird-droppings. Eggs are laid singly or in
small groups, mainly on the underside of leaves, and
hatch in about two weeks. Larvae then feed for several
678
679
678
Adult of
Hedya dimidioalba
.
679
Larva of
Hedya dimidioalba
.
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