Biology Reference
In-Depth Information
Croesia bergmanniana (Linnaeus) ( 650-651 )
Generally common on wild and cultivated rose ( Rosa );
in mainland Europe also reported on alder buckthorn
( Frangula alnus ) and common buckthorn ( Rhamnus
cathartica ). Present throughout central and northern
Europe; also occurs in North America.
spring. Larvae feed from April onwards, inhabiting
tightly folded leaves or spun shoots and sometimes
spinning a shoot tip to an adjacent flower bud. Pupation
occurs in the larval habitation or in a folded leaf. Adults
appear a few weeks later.
DAMAGE
If numerous, the larvae cause noticeable distortion and
loss of young shoots, affecting growth and reducing
flowering potential of the bushes.
DESCRIPTION
Adult: 12-15 mm wingspan; head, thorax and fore
wings bright yellow, the latter suffused with brownish
orange and bearing often dark-edged silvery-grey
markings; hind wings brownish grey. Larva: up to
10 mm long; greenish grey to yellowish white or yellow,
with indistinct pinacula; head, thoracic legs, prothoracic
and anal plates brownish black or black; anal comb
present. Pupa: 7-8 mm long; dark brown, with a
yellowish-brown or light brown abdomen.
Croesia holmiana (Linnaeus) ( 652-653 )
An often common but minor pest of ornamental trees
and shrubs, including blackthorn ( Prunus spinosa ),
crab-apple ( Malus ), Chaenomeles , hawthorn
( Crataegus ) and rose ( Rosa ). Eurasiatic. Widely
distributed in central and northern Europe.
LIFE HISTORY
Moths occur in June and July, often flying during the
afternoon as well as at night. Eggs are laid on the stems
of rose bushes, where they remain until the following
DESCRIPTION
Adult: 12-15 mm wingspan; fore wings orange-yellow,
suffused with dark reddish brown, each with a
distinctive white triangular mark; hind wings dark grey.
651
650
650 Adult of Croesia bergmanniana .
651 Larva of Croesia bergmanniana .
652
653
652 Adult of Croesia holmiana.
653 Larva of Croesia holmiana .
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