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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