Biology Reference
In-Depth Information
431
432
431
Mine of
Amauromyza flavifrons
in leaf of
Dianthus
.
432
Mine of
Amauromyza verbasci
in leaf of
Buddleja
.
Agromyza idaeina
(Hardy)
syn.
A. potentillae
(Kaltenbach);
A. spiraeae
Kaltenbach
Irregular, light brown blotch mines formed by this
widely distributed and locally common species
sometimes occur on the leaves of ornamental
Geum
and
Potentilla
, but are more frequently noted on raspberry
and strawberry. Attacks check the growth of young
plants but are rarely important. Although mainly a
European pest, this leaf miner is also present in Canada.
Amauromyza maculosa
(Malloch)
A polyphagous, mainly tropical or subtropical American
species found occasionally in northern Europe on
imported
Chrysanthemum
cuttings. The larvae feed
gregariously within expansive leaf blotches, fully fed
individuals pupating externally in reddish puparia. The
posterior spiracles of larvae each have three pores. There
are several generations each year, but infestations are
unlikely to become established in northern Europe,
except in heated greenhouses.
Agromyza johannae
de Meijere
Widespread and locally common in association with
broom (
Cytisus
) and Spanish broom (
Spartium
junceum
). The larvae mine the leaves, and sometimes
cause significant damage to cultivated bushes. Each
mine begins as a thin, linear gallery, usually following
the leaf margin towards the apex; it then turns abruptly
and develops into an elongate, central blotch. Fresh
mines are inconspicuous, and infestations often pass
unnoticed until mined leaves dry up prematurely and
die. Adults (wings 2.2-2.9 mm long) are greyish black
with a reddish frons.
Amauromyza verbasci
(Bouché) (
432
)
Large, conspicuous blotches formed by larvae of this
species are sometimes noted on the leaves of cultivated
buddleia (
Buddleja
). Each mine commences as a
narrow, contorted gallery but soon widens into a broad
blotch. Although disfiguring, particularly if present in
large numbers, damage is not important. Cape figwort
(
Phygelius capensis
), figwort (
Scrophularia
) and
mullein (
Verbascum
) are also hosts. Adults (wings
2.5 mm long) are mainly greyish black, with a yellow
frons and bright yellow knees.
Aulagromyza hendeliana
(Hering) (
433
)
syn.
Paraphytomyza hendeliana
(Hering)
Infestations of this locally common species occur on
honeysuckle (
Lonicera
), pheasant berry (
Leycesteria
crocothyrosos
) and snowberry (
Symphoricarpos
rivularis
), the yellowish larvae (up to 3 mm long)
forming long, brownish to whitish leaf mines. Occupied
mines occur from late April or May onwards, the larvae
pupating externally. There are several generations
annually. Adults (wings 2.5-2.75 mm long) are mainly
greyish to brownish, with yellow knees.
Amauromyza flavifrons
(Meigen) (
431
)
Larvae of this widespread but local species mine the
leaves of various plants, including carnation (
Dianthus
caryophyllus
) and pink (
D. plumarius
),
Gypsophila
and
Silene
; outbreaks on carnations and pinks are particularly
serious, and heavily infested plants may be killed. The
yellow larvae (up to 3 mm long) feed during the summer,
each forming a characteristic white blotch mine, preceded
by a narrow gallery (cf.
Delia cardui
, p. 206). Pupation
occurs on the ground in a reddish-brown puparium.
Adults (wings 2 mm long) are black and yellow, with
bright yellow halteres and black legs.
Search WWH ::
Custom Search