Biology Reference
In-Depth Information
1001
1002
1001
False acacia sawfly (
Nematus tibialis
).
1002
Larva of false acacia sawfly (
Nematus tibialis
).
1003
1004
1003
Young larva of false acacia sawfly (
Nematus tibialis
).
1004
Larva of
Nematus bergmanni
.
Nematus bergmanni
Dahlbom (
1004
)
syn.
N. curtispina
(Thomson)
A generally common species, the larvae feeding on
the leaves of willow (
Salix
), especially crack willow
(
S. fragilis
) and white willow (
S. alba
). Infestations
occur from May to October, but the larvae are rarely
numerous and do not cause extensive damage.
Individuals (up to 18 mm long) are green, with a broad,
translucent-white or pinkish-white dorsal stripe and a
pair of darker subdorsal stripes; the head is pale
yellowish brown, marked with brownish black, and the
tapered body terminates in a pair of reddish cerci.
Adults (6-8 mm long) are mainly black, with the lighter
parts of the body green; they occur from April onwards.
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