Amphorophora idaei Borner Large raspberry aphid

Although commonly associated with wild and cultivated raspberry, and closely related plants (but not blackberry), this aphid is rarely numerous and is of significance mainly as a vector of raspberry leaf spot and raspberry mosaic viruses.

BIOLOGY

This species overwinters in the egg stage. Nymphs appear from early March onwards and then feed on the tips of the developing buds. Later, they invade the underside of expanded leaves. The aphids are usually present in relatively small numbers and do not form dense colonies (cf. small raspberry aphid, Aphis idaei, p. 108). In June and July, after two generations of wingless forms, winged aphids are produced, and these are responsible for spreading infestations. Sexual forms, including alate males, occur in the autumn. Winter eggs are deposited on the canes by oviparae from October onwards.

DESCRIPTION

Aptera 2.6-4.1 mm long, shiny, pale yellowish-green to green; antennae and legs long and slender; siphunculi pale, elongate and slightly swollen on the apical half, with the tip flanged; cauda finger-shaped.

Fig. 188 Siphunculi and caudas of some aphids associated with salad or vegetable crops: (a) pea aphid. Acyrthosiphonpisum; (b) black bean aphid, Aphis fabae; (c) melon & cotton aphid, Aphis gossypik (d) cabbage aphid, Brevicoryne brassicae; (e) vetch aphid Megoura viciae; (f) currant/lettuce aphid, Nasonovia ribisnigri.

Fig. 188 Siphunculi and caudas of some aphids associated with salad or vegetable crops: (a) pea aphid. Acyrthosiphonpisum; (b) black bean aphid, Aphis fabae; (c) melon & cotton aphid, Aphis gossypik (d) cabbage aphid, Brevicoryne brassicae; (e) vetch aphid Megoura viciae; (f) currant/lettuce aphid, Nasonovia ribisnigri.

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