Biology Reference
In-Depth Information
Yponomeuta evonymella
(Linnaeus) (
576-577
)
syn.
Y. padi
Zeller
A widely distributed and often abundant species on
bird-cherry (
Prunus padus
), the greenish-grey, black-
spotted larvae commonly causing complete defoliation
of host trees and coating the trunks and branches in
dense, polythene-like sheets of webbing. Adults
(23-25 mm wingspan) are larger than those of
Yponomeuta padella
; also, the fore wings are pure
white, with white cilia and five or six longitudinal rows
of black dots (including a row of 9-11 dots towards the
lower margin); the hind wings are dark grey. The
biology of both species is similar but individuals of
Y. evonymella
pupae in white, opaque cocoons formed
in distinct clusters within the larval web.
rows of black dots) and dark grey hind wings. The
larvae are yellowish grey, marked with black spots.
Pupae are light brown, and formed within the larval web
in spatially separated silken cocoons.
Yponomeuta rorrella
(Hübner) (
578-581
)
syn.
Y. rorella
(Hübner)
This uncommon, local, southerly-distributed species is
essentially similar to
Yponomeuta padella
, but the
larvae feed on white willow (
Salix alba
) and sometimes
on other species of
Salix
, including grey willow
(
S. cinerea
), osier (
S. viminalis
) and pussy willow
(
S. caprea
). The larvae inhabit compact webs on the
branches and cause noticeable defoliation. Individuals
(18-20 mm long when fully grown) are greyish green,
marked with black or dark grey; the head, prothoracic
plate and anal plate are dark brown. The adults
(22-25 mm wingspan) are greyish white, with four
longitudinal rows of black dots on each fore wing and
dark grey hind wings. The pupae occur amongst the
webbing, but with little protection.
Yponomeuta plumbella
(Denis & Schiffermüller)
This uncommon, relatively small species occurs on
spindle (
Euonymus
). At first, the larvae feed within the
shoots, causing them to wilt, but they later inhabit webs
on the foliage. Adults (16-18 mm wingspan) have
greyish-white fore wings (each with four longitudinal
Yponomeuta sedella
Treitschke
syn.
Y. vigintipunctata
(Retzius)
Sedum small ermine moth
This moth is a local, mainly southerly-distributed pest of
cultivated stonecrop (
Sedum
), occurring most commonly
on orpine (
S. telephium
). The yellowish-grey, black-
spotted larvae (up to 25 mm long) feed in small groups
in June to July and in September to October, forming
silken webs on the foliage. Fully grown larvae pupate in
opaque, silvery-white cocoons spun amongst withered
leaves at the base of the host plant. Adults (22-25 mm
wingspan) are mainly grey, with three longitudinal rows
of black spots on each fore wing. They occur in April
and May, and again in August.
576
Ypsolopha dentella
(Fabricius) (
582-583
)
syn.
Y. harpella
(Denis & Schiffermüller)
Generally common on honeysuckle (
Lonicera
) and
occasionally a minor pest of cultivated plants. Widely
distributed in Europe.
576
Web of
Yponomeuta evonymella
on
Prunus padus
.
577
DESCRIPTION
Adult:
17-21 mm wingspan; fore wings dentate at tip,
chocolate-brown, marked with yellow and white; hind
wings grey.
Larva:
up to 18 mm long; yellowish green,
with a broad, reddish, black-marked stripe down the
back; head yellowish, marked with brown.
577
Adult and pupal cocoons of
Yponomeuta evonymella
.
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