Biology Reference
In-Depth Information
974
975
974
Larva of rose slug sawfly (
Endelomyia aethiops
).
975
Rose slug sawfly (
Endelomyia aethiops
) damage to leaf
of
Rosa
.
976
977
976
Larva of
Fenusa dohrnii
.
977
Mines of
Fenusa dohrnii
in leaf of
Alnus
.
Endelomyia aethiops
(Fabricius) (
974-975
)
syn.
E. nigricolle
(Cameron);
E. rosae
(Harris)
Rose slug sawfly
An often common pest of rose (
Rosa
). Widespread
throughout Europe; also present in North America.
adults, but development is sometimes delayed for a
further year.
DAMAGE
Infested leaves become extensively blanched, the
damaged areas eventually turning brown and shrivelling
up. Severely infested bushes appear scorched and their
growth is checked.
DESCRIPTION
Adult:
4-5 mm long; black, with smoky wings; legs
mainly black, with the tibiae and knees of the fore and
middle legs yellowish white.
Larva:
up to 15 mm long;
head yellowish brown; body yellow and translucent, the
gut contents imparting a greenish tinge.
Fenusa dohrnii
(Tischbein) (
976-977
)
syn.
F. melanopoda
(Cameron);
F. westwoodi
(Cameron)
A generally common pest of alder (
Alnus
). Holarctic.
Widespread in central and northern Europe.
LIFE HISTORY
This species is mainly parthenogenetic. Adult females
occur from May to June, depositing eggs on the
underside of rose leaves in slits cut close to the edges.
The eggs hatch in 1-2 weeks and the larvae then feed on
the upper surface, leaving the lower surface more or less
intact. Larvae are fully fed in 3-4 weeks; they then enter
the soil, usually in late June or early July, to construct
silken cocoons in which to overwinter. Individuals
pupate in the spring, shortly before the emergence of
DESCRIPTION
Adult:
3-4 mm long; body black and shiny, the
abdomen stumpy; wings blackish.
Larva:
8-10 mm
long; whitish, with a light brown head and prothoracic
plate; a large black plate present between the first pair
of legs, and a small black spot sited between the second
and third pairs, these markings absent after the last
moult.
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