Biology Reference
In-Depth Information
Aulacaspis rosae (Bouché) ( 195 )
Rose scale
This widespread species occurs most commonly on
non-hybrid rose ( Rosa ), but also attacks blackberry
( Rubus fruticosus ), both sexes developing on the stems.
Female tests are 2.0-2.5 mm across, whitish to greyish
and more or less oval, with the brownish-yellow
nymphal exuviae usually placed eccentrically at the
margin; the tiny male tests are elongate (0.8
Male nymphs appear in the autumn but female nymphs
usually not until the following spring. Individuals of
both sexes reach maturity by May or June, when mating
occurs. Adult males are winged and have a long caudal
spine.
Carulaspis juniperi (Bouché) ( 196-198 )
syn. C. visci Schrank
Juniper scale
A common pest of cypresses ( Chamaecyparis and
Cupressus ), juniper ( Juniperus ) and Thuja ; also
associated with Wellingtonia ( Sequoiadendron
giganteum ). Widely distributed in Europe, including
Belgium, France, Germany and the British Isles, but
detailed distribution uncertain owing to confusion with
related species.
0.3 mm)
and white. When clustered on the bark the tests spoil the
appearance of host plants, infested wood developing a
scurfy appearance. Heavy attacks, which occur most
commonly in sheltered sites, also reduce plant vigour. In
July or early August, fertilized females lay eggs which
they protect with their body. Eventually, orange-
coloured first-instar nymphs appear. These nymphs
wander over host plants but then become sedentary.
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195
196
195 Colony of rose scale ( Aulacaspis rosae ) on Rosa .
196 Female scale of juniper scale ( Carulaspis juniperi ).
197
198
197 Male scale of juniper scale ( Carulaspis juniperi ).
198 Foliage of Juniperus heavily infested with juniper scale
( Carulaspis juniperi ).
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