Insects - Pests of Ornamental Trees, Shrubs and Flowers - page 225

Phyllonorycter salicicolella (Sircom) ( 541 )
Blotch mines of this generally common species occur
on the underside of leaves of common sallow ( Salix
atrocinerea ), grey willow ( S. cinerea ) and other broad-
leaved willows. They are often present on young shrubs
and, if formed close to the leaf margin, cause noticeable
distortion of the leaf blade. There are two generations
annually, larvae feeding in July and from September to
October. Larvae are whitish green, with an orange spot
on the sixth abdominal segment. Adults (7.0-8.5 mm
wingspan) have light brown, white-striated fore wings.
They occur in May and from late July to August.

Phyllonorycter trifasciella (Haworth) ( 542 )
Generally common on honeysuckle ( Lonicera ) and
snowberry ( Symphoricarpos rivularis ), and sometimes
a minor pest of cultivated plants. The larvae feed in
distinctive blotches formed on the underside of the
leaves, causing considerable distortion of the leaf blade.
There are usually three generations, larvae feeding in
March to April, July and October. The mainly brownish-
orange adults (7-8 mm wingspan) appear in May,
August and November.

Phyllonorycter ulmifoliella (Hübner) ( 543 )
A generally common species on birch ( Betula ), the
larvae developing in blotch mines formed on the
underside of leaves. The mines are characterized by
several longitudinal folds which coalesce across the
middle; the upper surface appears slightly mottled.
Although relatively small, the mines cause noticeable
distortion of leaves and often disfigure young trees,
including nursery stock. There are two generations
annually, occupied mines occurring in July and again in
the autumn. The larvae (up to 5 mm long) are pale
yellowish green, with a yellow spot on the sixth
abdominal segment. Adults (7-9 mm wingspan) occur
in May and August; the fore wings are golden brown,
marked with several white, partly blackish-bordered
striae and a white basal streak.

541

541 Mine of Phyllonorycter salicicolella in leaf of Salix .

543

542

542 Mine of Phyllonorycter trifasciella in leaf of
Symphoricarpos .

543 Mines of Phyllonorycter ulmifoliella in leaf of Betula .