Biology Reference
In-Depth Information
77
76
76 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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