Biology Reference
In-Depth Information
Aphis sedi
Kaltenbach (
81-82
)
Widely distributed on various members of the
Crassulaceae, including cultivated species of
Kalanchoe
and stonecrop (
Sedum
). Infestations are often heavy on
greenhouse and indoor plants, affected shoots becoming
distorted and coated in masses of sticky honeydew. The
aphids are small (1.0-1.7 mm long), and mainly dark
green to blackish green. They occur in large, ant-
attended colonies, particularly on the younger growth;
infestations also develop on aerial roots.
Spiraea
; the latter including fruit trees, especially
Citrus
, and many ornamentals). In southern Europe and
North Africa, the aphids occur throughout the year on
their secondary hosts and the lifecycle does not involve
a sexual phase. The aphids are capable of causing
considerable damage, including extensive leaf curl; they
are also vectors of plant viruses.
Aulacorthum circumflexum
(Buckton) (
84-85
)
Mottled arum aphid
An often abundant, polyphagous pest of indoor and
greenhouse ornamentals, including
Asparagus
plumosus, Begonia, Calceolaria,
calla lily (
Zantedeschia
aethiopica
),
Cineraria, Chrysanthemum, Cyclamen,
Freesia, Fuchsia, Hippeastrum, Lilium, Petunia
,
primrose (
Primula vulgaris
), rose (
Rosa
), saxifrage
(
Saxifraga
), tulip (
Tulipa
) (including dry bulbs in store),
violet (
Viola
), and various orchids and ferns; also
important as a virus vector. Virtually cosmopolitan.
Widely distributed in Europe.
Aphis spiraecola
Patch (
83
)
syn.
A. citricola
Patch
Green citrus aphid
A polyphagous pest of East Asian origin; now widely
distributed in warmer parts of the world, including
southern Europe. The relatively small aphids (1.2-2.2
mm long) are mainly green or yellowish green, with
black siphunculi, and are very similar in appearance to
Aphis pomi
. In Asia and North America,
A. spiraecola
has both primary and secondary hosts (the former
82
81
81
Colony of
Aphis sedi
on shoot of a cactus.
82
Colony of
Aphis sedi
on aerial roots of a cactus.
83
84
83
Leaf curl caused by green citrus aphid (
Aphis spiraecola
).
84
Mottled arum aphid (
Aulacorthum circumflexum
).
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