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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