Biology Reference
In-Depth Information
Cladius difformis
(Panzer) (
965-967
)
Lesser antler sawfly
Widespread and common on wild and cultivated rose
(
Rosa
), the larvae also feeding on marsh cinquefoil
(
Potentilla palustris
), meadowsweet (
Filipendula
ulmaria
) and strawberry (
Fragaria
). Present throughout
Europe; also occurs in North America, but probably
introduced.
LIFE HISTORY
Adults occur in May, depositing eggs singly in the leaf
stalks. After egg hatch the larvae browse on the
underside of leaves, most often attacking fully
expanded leaflets. Larvae are fully grown in four or five
weeks and then pupate in thin, double-walled, brownish
cocoons formed on the leaves or amongst debris on the
ground. Adults emerge two or three weeks later, usually
in late July or August. Larvae of a second generation
feed during August and September, eventually
overwintering in cocoons and pupating in the spring.
DESCRIPTION
Adult:
5-7 mm long; body black; legs yellowish white;
antennae of male with characteristic, long projections on
the two basal segments and shorter projections on the
third and fourth segments; female with slight projections
on the first and second antennal segments.
Larva:
up to
12 mm long; somewhat flattened and distinctly hairy;
head yellowish brown; body translucent, yellowish to
light green, with darker subdorsal stripes; young larva
paler, with a blackish head.
DAMAGE
At first, larvae 'window' the leaves, the upper
epidermis remaining intact; older larvae make holes
right through the leaf blade and also browse on the
leaf edges. Such damage is disfiguring but of
significance only if extensive.
Cladius pectinicornis
(Geoffroy in Fourcroy)
Antler sawfly
This abundant sawfly occurs widely in Europe and parts
of Asia, the larvae often attacking cultivated rose (
Rosa
).
Adults of
Cladius pectinicornis
are distinguished from
those of
C. difformis
(with difficulty in females) by the
longer and increased number of antennal projections. Both
species have a similar lifecycle and cause similar damage.
965
Claremontia waldheimii
(Gimmerthal)
syn.
C. subcana
(Zaddach);
C. subserrata
(Thomson)
Larvae of this widely distributed species infest
cultivated
Geum
during the summer months. They are
very similar in appearance to those of the more
frequently encountered species
Monophadnoides
geniculatus
(p. 377) but slightly larger (up to 15 mm
long). Adults (5.5-6.5 mm long) are shiny black with
mainly white tibiae. They occur in May and June.
965
Female lesser antler sawfly (
Cladius difformis
).
966
967
966
Larva of lesser antler sawfly (
Cladius difformis
).
967
Young larva of lesser antler sawfly (
Cladius difformis
).
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