Biology Reference
In-Depth Information
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76
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Colony of iris aphid (
Aphis newtoni
).
77
Earthen shelter around colony of iris aphid (
Aphis
newtoni
).
78
79
78
Colony of green apple aphid (
Aphis pomi
) on
Cotoneaster
.
79
Colony of elder aphid (
Aphis sambuci
).
80
forms to the roots of various secondary hosts, including
cultivated species of
Dianthus
and saxifrage
(
Saxifraga
); colonies on these summer hosts survive
until the autumn, when a return migration to elder takes
place. The winter is normally passed in the egg stage on
elder but it is possible that a few aphids are able to
survive on the roots. Apterae on elder are 1.9-3.5 mm
long, greyish green to yellowish brown (coated with
whitish or greyish wax), with dark, elongate and tapered
siphunculi and a bluntly rounded cauda; apterae on
summer hosts are smaller, and bluish green in colour.
Aphis schneideri
(Börner) (
80
)
Permanent currant aphid
Infestations of this local, but widely distributed, aphid
are most numerous on black currant but also occur on
the ornamental species golden currant (
Ribes aureum
),
causing distortion and tight bunching of the leaves.
Adults are 1.2-2.2 mm long and dark green, dusted with
bluish-grey wax. Colonies are typically ant-attended,
and particularly damaging on young plants.
80
Colony of permanent currant aphid (
Aphis schneideri
) on
Ribes aureum
.
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