Biology Reference
In-Depth Information
Cryptomyzus korschelti
(Börner) (
90-91
)
Infestations of this widely distributed species are
associated with alpine currant (
Ribes alpinum
). The
aphids cause noticeable discoloration and blistering of
the foliage, and damage is often severe. The aphids
occur on alpine currant throughout the spring and early
summer, having overwintered in the egg stage. Winged
forms are produced during the summer, and these
migrate to woundwort (
Stachys
), the secondary host,
where breeding continues. There is a return migration to
alpine currant in the autumn. The aphids are delicate,
shiny and rather plump, and whitish to light orange; the
siphunculi are relatively long and thin.
Dactynotus tanaceti
(Linnaeus)
This uncommon aphid occurs occasionally on
greenhouse-grown
Chrysanthemum
, forming colonies
on the underside of leaves. Apterae are 2.0-2.5 mm
long, dark reddish brown, with long antennae and long,
black siphunculi and capitate body hairs.
89
88
88
Colony of thistle aphid (
Brachycaudus cardui
) on
Senecio
cineraria
.
89
Colony of willow/carrot aphid (
Cavariella aegopodii
) on
Salix triandra
.
90
91
90
Galls of
Cryptomyzus korschelti
on
Ribes alpinum
.
91
Colony of
Cryptomyzus korschelti
on
Ribes alpinum
.
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